Let's be clear about something here before we begin: everybody is an expert (or "expert enough") in at least one body of knowledge. It doesn't matter what it is. Maybe you know how to sing a little bit better than everybody else, maybe you know your way around the basketball court, maybe have discovered a way of running a little bit faster, or maybe you know how to make money with Twitter or Facebook.

Regardless of who you're dealing with, everybody has at least one area of expertise.