Our feeling is that the most important thing on a set is that actors have enough confidence to try different things. If there's stress or tension, they won't go out on a limb because they won't want to embarrass themselves if they don't feel completely comfortable.
“The secret of how to live without resentment or embarrassment in a world in which I was different from everyone else. was to be indifferent to that difference.”
“Don't believe your friends when they ask you to be honest with them. All they really want is to be maintained in the good opinion they have of themselves.”