I can't tell you about acting. You can develop all the skills, voice, gesture, movement, you can develop by exercise and practice but finally fundamentally it's mining from yourself, from your own personality, from what you know. If you can't know it you can have a good guess by people you know or books you've read.
Peter O'TooleThe good parts are the people who don't make do. They're the interesting people. Lear doesn't make do.
Peter O'Toole