I know some amazing actors who are not mortified every moment of the day, so my feeling is that maybe you don't have to be a wreck to be good.
As an actor, you try to bring as much of yourself to a part to try and create a feeling of authenticity and emotional truth and resonance.
I feel like when I was 13 and I had to go to bar mitzvahs every weekend. This is the same feeling. You have to put on a suit every weekend to go meet with a bunch of Jews.
My feeling is... when you show up to a movie set where there's, like, 50 people standing around and months of preparation gone into it, you want to be as prepared as possible, so you should make a million baguettes. That might not actually help in any explicit way, but it'll make you feel more prepared.
