My friend Jeff just asked me this question. He was looking for a designer for a one-off graphic design job. He had the project all scoped out. He just didn't know how to do it. He's not a fool; he web searched around for stuff, but what you find doing that is a confusing mess with plenty of results that don't feel right.
I figured I'd document that journey here, and contrast it hiring an electrician. A trite comparison, perhaps, but as the light switch in my bathroom doesn't work right now and I'm actually in the process of hiring an electrician, it seems apt.