I always admire people who do commercials because they have to put together a beginning, a middle, and an end in 30 seconds.
Everything is difficult, and everything worthwhile is difficult. A certain need, a need not unlike Mickey had: to know, to understand, and I had that need to understand and to know.
An actor would be foolish to do something that might hold up the picture, or more importantly incapacitate him. If an actor does do a stunt he needs to make sure a stunt man stands by to see that it's done correctly.