The first thing that happens is the cleansing of the former character. I don't think a lot of actors talk about it, but there is usually a process where you essentially purge yourself of the character played prior to the movie. Then you want to think about what the character represents, and you write down all of the elements about this character and then take the time to find some synchronicity and start breathing the character.
Vin DieselWhen you come onto the set, everything should be focused around your character and you should stay in the pocket, as much as possible. Every actor has their own process. For me, I really need to stay in the pocket.
Vin Diesel