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.
As an actor you really want to respect and honor the script. You want to try to be in the moment and you also realize that you're one part of a bigger picture and when they call action you have your dance.