As factors in your career success, it's not just how competent you are, and it's not just about the words you say: no less important are the non-verbal messages you send . . . and read in others. I cover some of this in my books, but let me recommend "How 'Power Poses' Can Help Your Career"-- an excellent article with accompanying video from the Wall Street Journal.
The article is not--as you might suspect--about being a phony poseur, but rather about how to pay attention to the body-language and other non-verbal messages you are sending . . . and receiving.