I thought I understood the story very well, because I've lived with it for so long. But movies change and take on a life of their own once they start to be made, and you have to keep your eye on the real ball, not the ball that's in your head. In doing everything, from coming up with the ideas and putting them on paper till doing the final edits, you are always thinking the next three steps, you're always thinking what next, what next, what next? You always have to keep thinking: "Where am I going?" Whereas acting, you're always thinking: "What am I doing?" You don't want to know where you're going, you want to be right where you are.