I think you need to bite the bullet and do it. I've just set up a website and a Facebook page. I feel as though I could train for ever and keep learning - but really you've done enough training to be able to learn on your own, if you see what I mean?? You're good enough, even if you were the number one best makeup artist that ever lived there would be someone, somewhere you didn't like what you did. You need to tell yourself that you're competent, you're honest, you've got all the right kit and training, and you will just never please everyone. Accept that and go into it with a realistic expectation. Some will love what you do, others won't, but that's not a reflection on you it's just the nature of the game. Makeup is very subjective. I suspect a lot of the skill is in communicating with clients, being likeable and managing their expectations.