Kai,
Practice a lot then practice some more.
Slow cuts are easier to control than fast chops, and you are more likely to see which part of the blade/stroke etc gets the best results. I like to use a knife with a Scandi-ground blade, and hold the large bevel flat against the wood, remember that you are aiming to get very fine curls of ultra thin section.
There was a video clip somewhere where the surface of the stick was scored along its length before being featherd, resulting in many curls per cut. You also need a knife that is shaving sharp, especially to learn the technique.
ATB
Ogri the trog