There are a lot of people who seem to have totally irrational fears, at least based on the things that they post. Almost certainly
- you will not be present for a police raid
- nothing will happen to you if you are
- you will not be observed by anyone who knows you or cares
- you will not be approached by the guards or security while waiting
- no one will use the dates and times of your reviews, if you write them, to identify you
Realistically, you should be much more worried about a road accident going to or from the punt than about most of those things. I don't want to play amateur psychologist, but I think most of the things some punters appear to worry about are simply rationalisations. In other words, you are nervous, you think you must be nervous about something, and you look for things you might be nervous about. The feeling comes before the "reason".
I feel somewhat nervous before appointments, more so if I haven't met the lady before. It always disappears when they open the door.