I grew up on movie sets, so it was something I just found familiar. When I was growing up also, in high school, I would audition for things and my parents let me audition for things - with the thought that I wouldn't get them. And then I would get them... sometimes, and it would surprise them.
I did 'Bird,' it was a surprise to some people, first because I wasn't in it and second because most of the films I'd been doing were cop movies or westerns or adventure films, so to be doing one about Charlie Parker, who was a great influence on American music, was a great thrill for me.
In my career as a director, there's always been some point where you get halfway through it, or three-quarters, and you go: 'What is this thing all about, and why am I telling the story? Does anybody really care about seeing this?' At that time you have to say: 'OK, forget that and just go ahead.'