I think that there is no doubt that every experience you have in your life, whether it's playing a character or something else, you bring that to the work.
I never doubted at all. If you ever doubt then you are in trouble. I never thought: 'I should do this or that in case I don't make it.' I never had a back-up plan.
Theres no doubt that some of the greatest films ever made have come from the theater. Its all a matter of finding a way to make the theater experience watchable on film.