Interesting. Ive always been taught to sharpen knives by sweeping them not forward (but backward). I guess because usually the only sharpening surface I have is some concrete or a round stone and sweeping forward with them (as described) will just dull the actual cutting edge.
Ive certainly got the precision to hold the angle correctly.
What I wanna know is how to sharpen the Points of a knife well, that way it has a penetrating point just as sharp as the blade does. This is important in some situations (not talking about fighting or even skinning animals).