I've seen Yngnaughtygirly for a glory hole booking - only 15 min, OWO, CIM and swallow for i think £40. Was this year but before i was on UKP, so never did a proper review.
In brief, she gives a great blowjob. 15 mins was plenty, i think was done after about 7 mins! Good old knee trembler as she kept on sucking after I'd cum - always nice when that happens.
Assuming they're in the same place, there's wooden board with a hole cut in it, big enough for you to see her through when you walk in, but not once you've popped your todger through. I had the same worries you did but glad i went - another thing ticked off the bucket list.
I brief, if you're serious then go do it. I had a great time
