The point isn't to do a good job of it, the point is to do a better job than the people who are not doing it at all.

This is probably the most counterintuitive part of founding a startup that I've observed so far: if you're doing it right, you'll suck at everything you do. Why? Because if you don't suck at something, it's time to seek funding, hire people, and train them to do it. The founder's job is to seek out problems where everyone else sucks more and yet people still want it, which itself is quite a challenging task.