I was in your position a few weeks ago, not really seen a WG before etc. I found this site and have to say it's the best thing you could have done, it has all the information someone new needs. Make sure you read all the guides, as there's bound to be stuff in there you've not even thought about.
I would say for your first time go for someone well reviewed off here who works from a private location, from looking at that thread above I wouldn't see her for my first punt, seems like a few people had bad, or not as expected experiences, and that could put you off seeing anyone else in the future. Seeing someone in a hotel was also more nerve wracking for me (I did this once before a few years ago and it put me off doing it again until now).
I found someone well reviewed on here (it's best to take feedback on AW with a pinch of salt as it's hard to trust it), explained I was new to it all and she was very good about it. I've only seen her a few times so pretty new to it all still, but the shower does seem to come out the hour with her, but it only takes 5 mins so doesn't bother me. If you're not sure then just ask her.
Hope that helps a bit, good luck and hope you enjoy it!