Just like approaching that special someone who catches your eye at a party. Be real and talk from the heart. You have something you want to share with them. Focus on what you're trying to accomplish and what you need to know. Like public speaking, if you focus on the message and not on the audience, you'll be less nervous and more likely to succeed.
People are nice.
Don't think of people as makers or breakers of your dream. They are just stepping stones, some of which are more solid than others. Most of the time you'll find a receptive audience. People like to feel helpful, and requests for input or advice flatter them. Your energy and excitement will be contagious.