Just punch "knife sharpening" into Google. The principles of sharpening can be applied to any tool blade, so it is a worthwhile investiment to get the hang of it. I once watched a half-hour videotape of a guy sharpening chisels and gouges. Okay, I slept through most of it, but it did help my knife sharpening a bit.
Don't practice with an expensive knife, but if you have one, use something with a similar blade shape to practice.
The most important thing is hold it at a consistant angle to the stone. Wobbling, or even changing the angle slowly, makes a rounded inconsistant edge.
Remember that you are removing steel in the process, so if you aren't getting where you want, stop. Think through what you're doing wrong.
I find a knife holds its edge a little longer if it is stropped after sharpening.

go to you tube and do a search for david petzal and knife sharpening. you'll see a video of mr petzal himself sharpening a knife!!!