As long as you use a highly-rated company that matches you with your contractor, you shouldn't have to worry about whether or not you're getting a good service pro. Most of the time, contractors are vetted with background checks, license verifications, and the standing of their company before being available to work in someone's home. As long as you do your own research about the company you're using and their processes before hiring someone from their site, you don't need to worry!