How did you train?

To all you stunt rider people out there! How did you learn to do all that crazy stuff? Did you just start in your back yards? On what bike, who's bike? I imagine you must drop that thing more than once and then what? I can't think of dropping mine! Sooner or later I guess I will though. But it looks like sooo much fun and isn't there some kind of "school" one could go learn at?? Anyhow, stay safe all you!!