A simple but very difficult question, Les. In my performing experience it is all about self-confidence and experience, which cannot be learned. With it comes the ability to SHOW the audience that you love what you're doing, and communicate those things which lessons can't teach. You cannot consciously work at it, though it can and often does come with experience. On the other hand, after years some people don't have it and others have it naturally. Is this all as hopelessly vague as I think it is??