Why? Do you want to be a sushi chef? Have you ever made it for yourself and came to this counclusion? It would be nice if you could give us some story or a detail so that we can contribute more easily.
As for becoming a sushi chef, it doesn't seem to be as hard as it's made out to be. I think you have to be trained at a sushi restaurant, and usually it takes a while before you can actually make sushi. In a lot of places, they seem to give a trainee chores at first so that you'll know what needs to be done.