1. As people have said, doing your Research and finding an established, newbie friendly provider that you like will help out. I got lucky when I found bellabee on a different site. I had jitters at first, but she was able to put me at ease. I would recommend her, but I am not sure she is around anymore.
2. Listen to your spidey-sense. If you feel uncomfortable, dont hesitate to walk away, say no, or do whatever you have to do.