When you speak to people (who almost always want to be in the audience), your job is to connect with them and give them something of value. Your task isn’t to be slick, charismatic, or a stand-up comic. So concern yourself instead with being honest and trustworthy. And if you happen to give a lackluster presentation, so what? Failure can be the best of teachers, since you’ll want to do that much better the next time.