What's important is to be able to see yourself, I think, as having commonality with other people and not determine, because of your good luck, that everybody is less significant, less interesting, less important than you are.
There is the danger of over preparation, of loss of spontaneity; over rehearsal is the most terrible thing you can imagine. We do have a very close association between costume and set designer, though. And the cameraman is very important, of course.