Few things tend more to alienate friendship than a want of punctuality in our engagements. I have known the breach of a promise to dine or sup to break up more than one intimacy.
But one of the hardest things for me to do was to access anger. I could do it on stage. But when I did it on film it was hard for me. That probably has to do with the intimacy of film. And my own personal issues with expressing anger. So I had to learn how to do that.