Here's a couple of things I've picked up:
* My understanding is that the little Worksharp motor does not like to be run slow. It increases the lifespan of the WS to run it as close to full speed as you can.
* If you are running the belt fast, you need to move the knife along the belt pretty quickly. Minimum 1" per second. So if you have a 3" blade, it should take you 3 seconds to go from heel to tip.
* It's very easy to put in a recurve at the heel. It takes practices to not do it. As soon as your blade touches the belt you need to keep it moving.
* It's very easy to dull the tip. I've done it on multiple knives. The instructions say to lift the knife when the tip is halfway across the belt. Never run the tip across the entire belt.
It takes practice.
* I don't know if there is consensus on this point I'm about to make, so take it or leave it: If you're not careful, you can ruin the heat treatment on the blade. Try not to let it get warm to the touch. I typically have a bowl with ice water while I sharpen to keep the temps down. Not sure if it's necessary though...
* Get a couple of junk knives to practice on. I went to my 20cv griptilian right away, and messed up the tip and needed to get the blade replaced. I'd have no problem sharpening it with the WS now, but I've sharpened at least 50 knives in the last year.
* I like the KO Worksharp, but only after I modified it to my liking. Other posters have already mentioned that the blade guides suck. I wholeheartedly agree. I am also pretty tight on my knife budget, so didn't want to buy the blade grinding attachment.
Here's what I did to make it more like the grinding attachment.
https://www.bladeforums.com/threads/ko-worksharp-mod-horizontal-sharpening.1620040
Have fun, it's really exciting to get your first mirrored edge.
Edit: One more...
* To make sure that you are actually sharpening the bevel, use the sharpie trick. Mark the bevel with the sharpie, and adjust the angle until you are able to remove most of the sharpie mark with a single pass. That will tell you if your angle is too low or high.