Here is a very good tutorial for sharpening with a stone. As someone who has experimented with sharpening for 20 + years, I always find tutorials leave out small but critical details, but this guy covers them. So, give it a watch, and consider picking up our inexpensive sharpening kit and sharpen up all those old pocket knives you have laying in your desk drawer.
Hint: I use a stone to keep a razor edge on an X-Acto blade. Have been using the same blade for 5+ years. The metal is so soft, all it takes is about 10 passes on each side. Not as sharp as new but still very sharp and saves a lot of $ in replacement blades.
