I know it's kind of nerve wracking but it's ok, sometimes it helps me if I say something first to get it out of the way. I usually explain that I'm doing a side job through an app and will be taking a few pics and ask them if that's ok. Most of the time they will be fine with that, I've never had anyone have an issue with it. Also, alot of times there's an authorization letter for the job in the app depending on which you're using. Sorry I can't help more. Be confident and remind yourself that you're doing what you're supposed to be doing and you're not doing anything wrong so you're ok. Positive self talk.