First we have to manage ourselves. Then we can manage others. A lot of introverts, ironically, don't understand themselves very well because the world is pretty much geared toward extroversion, and we have been raised to believe that we need to be more extroverted. Yes, it is useful to exercise the parts of your personality that you don't use naturally, but:
Let's make sure we know whom we're dealing with first:
Mike at D&P has a lot of articles that I (as an Introvert) found very useful. They are male-oriented, but some if it can apply to any introverted person.