Rest your knife on the stone at your chosen angle. An easy method for determining the angle by eye is to visualize a 45 degree angle and then take half that amount. That will give you a ballpark estimate of the angle and then you can adjust accordingly up or down. With a slicing action bring the length of the knife across the stone with a motion that starts with the heel of the knife on the stone and ends with the point of the knife. The motion should resemble a sweeping arc pattern across your stone. Be very careful to maintain the angle of the knife on the stone. Longer curved knives provide additional challenges but as long as you can maintain the angle you will be sharpening very effectively. Repeat this process on the other side of the knife and continue repeating until you have sharpened your knife though all your stone grits.
Japanese water stones – both natural and synthetic – are known for their superior sharpening performance, not only for Japanese tools, but also on their Western equivalents. The loosely bonded abrasive grit is washed out very quickly, as it blunts during the sharpening process; this exposes new, sharp, particles that can get to work on the blade. Water stones are lubricated only with water! Never use oil!
using an appropriate blade for the task – a thinner blade for more delicate work, and a thicker blade whenever a thinner blade is not required (e.g. a thinner blade might be used to cut fillets, butterfly steak or roast for stuffing, or perform Mukimono, while a thicker one might be used to slice or chop repeatedly, separate primal cuts of poultry or small game, or scrape and trim fat from meat or hide, as these actions would be more likely to cause unnecessary wear on a thinner blade.)
Different knives are sharpened differently according to grind (edge geometry) and application. For example, surgical scalpels are extremely sharp but fragile, and are generally disposed of, rather than sharpened, after use. Straight razors used for shaving must cut with minimal pressure, and thus must be very sharp with a small angle and often a hollow grind. Typically these are stropped daily or more often. Kitchen knives are less sharp, and generally cut by slicing rather than just pressing, and are steeled daily. At the other extreme, an axe for chopping wood will be less sharp still, and is primarily used to split wood by chopping, not by slicing, and may be reground but will not be sharpened daily. In general, but not always, the harder the material to be cut, the higher (duller) the angle of the edge.

This coarse grit whetstone is great for prepping old and dull knives that need to be sharpened with a fine grit stone. One of my good knives edge looked like someone had tried to chop barbed wire. After ten minutes on each side of the stone, the edge was smooth and free of imperfections. After it hit the knife with the fine grit stone, I was cutting onions and apples like hot butter! I would soak this stone for 12-24 hours before using. It sucks water like a sponge. The surface needs to be damp when you sharpen.

The video above, from the How To You YouTube channel, explains everything you need to sharpen with a whetstone at home, and the best methods for doing so. Obviously, you’ll need a whetstone (as well as a few other things), and you’ll want to work near your sink or a bucket so you have easy access to water. Fill a container with water, then soak the whetstone in it until it stops bubbling. Inspect your blades for any trouble spots, and get to sharpening using the methods and motions described in the video; making sure to check your progress as you go. We’ve talked about sharpening knives with whetstones before, but this guide is a bit more thorough and the old video has since been removed.

This is great combination but you don’t need them all to get started. As your budget allows, start with one stone and although I like to start with a coarse stone, the 400 Chosera is a little coarse to start the learning process with and you would need another stone in a higher grit to finish. So if you want to start with one water stone, and that is perfectly okay, select the 1,000 grit stone, it will deliver an edge that will startle you, with practice of course. Also, just having a water stone in your possession is going to motivate you, trust me.

Over the course of two days I re-sharpened nearly a dozen old blades, including removing the secondary bevel on an old stainless Ontario saber-grind Navy diver's knife, convexing the edge on flat ground 1095 Schrade 55 that also came with a secondary bevel, and fixing a broken tip on an old Kershaw folder. These stones made quick work of the Schrade and Kershaw. Both had completely new edge geometry within 30 minutes apiece. The Kershaw looked like-new, as if the tip had never broken. And the Schrade cut much better than it's secondary bevel would previously allow, regardless of how sharp I got it with a ceramic rod and strops. The Ontario took a little more work, as it had been abused a little the last time I'd held it, over 25 years ago and was as dull as a case knife - one of the reasons I decided to go ahead and do a full saber grind - well, a slightly convexed saber, I suppose would be more accurate. But within under an hour of using the two stones and a couple leather strops (one with black compound, another with green), the Ontario was shaving sharp again too.
If in doubt or just learning, a safe bet is a set of quality synthetic stones. They’re the easiest to use, require the least maintenance and are the most forgiving. If you’re just starting out we highly recommend the Naniwa Sharpening Stones. They’re excellent quality, reliable, durable and no soaking time is required. For advanced users we recommend the Naniwa Pro sharpening stones or Kaiden Ceramics.
"How do I use this daunting metal rod?" I hear you ask. Well, it's not too hard, really. The best way for a beginner is to balance the steel on a surface with the tip secured by a damp tea towel. You want to get that angle right, whether it's around 15 degrees for a Japanese knife or 20 degrees on a German or French blade. Then swipe slowly down, away from you, making sure the whole blade is honed – around five swipes on each side should do. 
Now to finish: Again with P1 pressure, trailing strokes only, this time lift the blade off the stone as you finish pushing it over the stone away from you, bring it back and repeat this 5 times, on each side. The burr should be gone and your knife will be sharp, remember, manage your expectations but if you have followed this, that knife is going to be sharper than when you started and this is just the beginning. Now you can test your knife for sharpness trying to cut some telephone book paper.
So you are going to start at the heel and you are going to time it so that it goes all the way across. You go from one side to the other. You also want to make sure that your stone, I am not going to use as much pressure as I normally would because I cannot mount it on this showcase, you want to alternate from side to side to keep your bevel centered. Some people will take and do three times on one side and then three times on the other, the problem is that your backhand is never as good as your forehand and you end up cheating and you are going to end up with a blade that is offset. That is going to take it and thin down, you are going to get a thin bevel right on the edge. Once you get that V established, you can go from the coarser side to the finer side.
Chefs will do this every day, and there's no reason you shouldn't too. Before cooking, or after you've done the washing up, honing your knife will help keep it in good condition. "When you're using a honing steel, you're not actually removing any metal at all, just re-straightening that edge, to get it back in line," says Authbert. Remember that you'll still need to sharpen it every two or three months. 

Select the grit of the stone. Sharpening stones are available with different grit sizes. For example, you can choose fine, medium and coarse stones. You should use a coarse stone followed by a fine grit if your knives are dull. If your knives have been sharpened recently or they aren't too dull, consider using a medium grit. Try to use a grit level ranging from 325 (for coarse) to 1200 (for extra fine).[3]
The most important aspect of a sharpening stone is the grit. If you have knives that have taken a beating and are either nicked up or really dull, you’ll need a courser stone to get it back into shape. And in order to put an exceptionally sharp edge on an already sharp knife, you’ll need a finer grit stone. If your knives are already in pretty good shape and just need a touch up, buying just a finer grit stone might be enough, but don’t think you can get away without a courser stone for knives that need more TLC. It is possible to buy a combination, or two-sided sharpening stone.

Whichever method you choose, be it a waterstone (also known as a whetstone), or a pull-through (either V-shaped or ceramic wheels) it's important to regularly hone your knife with a honing steel, which we'll also cover below. You'll be pleased to hear that you won't have to reach for the stones too regularly – once every two or three months should suffice. 
When a whetstone is used to cut metal, it acts like sandpaper by removing small particles of metal (aka “swarf”) with each pass of the blade over the stone. Therefore, whetstones with more coarse grits cut faster than those with finer grits and, at the same time, soft whetstones cut faster than hard whetstones because each pass of the blade over both types of whetstones not only removes fine particles of metal from the blade, it also removes fine particles from the surface of the whetstone (aka “slurry”) which continuously exposes new cutting crystals. However, if the swarf is allowed to build up on the surface of the whetstone during sharpening, it will clog the stone and drastically diminish its effectiveness. Therefore, some whetstones require water to lubricate the stone and suspend the swarf whereas, other whetstones require oil to lubricate the stone and suspend the swarf.
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I've used ceramic rods, diamond plates, and leather strops for our sharpening needs. And, like most, I've tried a dozen little gimmicky sharpeners that, while some work, those that do often remove way too much material from the edge, making your blade wear down faster. I've also used oil stones, grinders and buffers for less meticulous sharpening of axes and such. These two stones from Unimi (600/1000 and 2000/6000) served as my introduction to whetstone sharpening. And I must say I like it. Though, I'm not sure of the need for investing in more expensive stones.

Your task as a sharpener is to remove that fatigued metal and expose the steel underneath, the fresh strong steel and bring side A and B of the knife together at the Apex precisely, sounds easy doesn’t it? Like peeling a layer off and having a fresh start, over and over. Of course there is much more to it than this but in very basic terms, you want the abrasive properties of the water stone to abrade the fatigued metal away, like an eraser.
At age 10, Terada learned the basics of sushi from his father and then went on to attend RKC Chef's School in Kochi, Japan from 1987-1989. He soon earned a nickname for his fast knife, attention to detail, divine presentation and ability to create new dishes and accents based on traditional Japanese cuisine. After graduating RKC Chef School, he was called to serve under Master Chef Kondo at Yuzuan restaurant in Kochi, Japan from 1989-1992. Mr. Kondo is the master of Kansai style cooking, considered to be the high-end of Japanese cuisine. Terada earned the title Master Sushi Chef by becoming the standing head sushi chef & can serve Fugu (Japan Licensed) to the public.
Now you are going to use P2 pressure, moderate and in this case the stone is going to do the work, you are just guiding the knife along, stabilizing it as the amazing water stones does it’s job. Use the exact same technique, same angle but just moderate pressure, hardly pressing down at all, you are not trying to form a burr here, that is already done, now you refining the edge and bevel, removing some of the scratches left by your first stage of the process. Here is where the knife will get sharp and it will happen quickly. Now you are removing the burr, you are cleaning up the edge, some of that fatigued metal is going to want to hang on to the mother ship, your moderate pressure is going to start taking it away, as reluctant as it is to leave, it won’t have a choice. This should only take a couple minutes just mimicking the first step but with lighter pressure and this time visualizing the burr being scraped away, it will start to vanish.
I recommend keeping two stones in your kit. One with a medium grit (around 800 or so) to perform major sharpening jobs, and one with a fine grit (at least 2,000) to tune the edge to a razor-sharp finish. For real pros, a stone with an ultra-fine grit (8,000 and above) will leave a mirror-like finish on your blade, but most cooks won't notice the difference in terms of cutting ability.
Honing is kind of like dusting the furniture while sharpening is more like reupholstering the furniture. Honing is purely a maintenance activity that should be regularly practiced to make sure the blade is clean and sharp as can be every time you use it. It’s easily done using a honing rod, a leather strop or a sharpening stone; as most stones have a side for sharpening and a side for honing. Honing is akin to trimming your hair to remove the split ends. It’s not a full on haircut. What it does is realign the tiny sharp protrusions along the edge of the blade that can be bent over with use, so that they stand more or less straight.
I recommend it as a lightweight alternative to larger stone for smaller knives. Leather necklace is comfortable and seems strong. I conditioned it for suppleness and swim with it on tightened as a choker. Stone is small, dog-tag size. I use it with water. Functional for small folder knives and multi-tools. Not useful for large fixed blades, since you can't make a long stroke. Small to grip. I use double-sided tape on one side to keep it in place on a flat rock. Not sure of grit, seems like around 1000. It took a while, but i got my old boy scout knife sharp.