You are worrying way too much.
First off, these are professionals. They are used to people being nervous, and will do everything they can to make you feel at ease.
They won't be expecting you to do anything. They will sense what you like, and will act accordingly.
They will not come, so forget about that.
Just relax, and go with what you feel comfortable with. You will be surprised that you were worrying over nothing, and that you did not visit one long ago.
Be respectful, and enjoy.
The Gods are just, and of our pleasant vices
Make instruments to plague us