It's always strange to me (or sad, I guess) to me when people with ideas want to start businesses without being terrified by their own incompetence and ignorance. I think that's usually a sign that a person doesn't actually feel very strongly about the problem they're solving, and that's a red flag.

If you really, truly care about solving some problem, it should drive you crazy that there's something that you have no idea anything about. IMHO.