Four hours of prosthetics every morning the jowls and the nose and it was very hot so they're having to attend to it all day and you're still petrified of so many things such as can I speak properly? Hitchcock never quite lost those East End vowels even though he had the softened California consonants.
Confronting a stadium audience you can't see the whites of their eyes. It's just an amorphous mass of noise and of course you can't see the alleged billions watching at home either so the degree to which you are intimidated is quite low.