I guess it will vary from hospital to hospital.
When I had mine last May I was very well looked after by the nurses. I was taken to a room to change, they gave me 2 hospital gowns...1 to wear forwards & 1 to wear like a coat, so no flashing bits. I kept my bra on. But had to put on a pair of paper pants with a flap on the back so they could gain access.
The canula for sedation was put in when I went into the next room, then I lay on my side for the procedure - which was not nearly as bad as I expected. It didn't hurt, it just felt a bit odd.
Afterwards my bed was wheeled to a recovery room, where I was left for 15 minutes, although a kind nurse came to explain things again.
Because I'd had sedation my husband had to come in to collect me. I could hear them ringing him & he wasn't picking up at first!
After I'd got dressed I was taken to another room & given a cup of tea & biscuits.
When my husband arrived we were taken to another room where the specialist nurse talked us through what had happened & what to expect next. They said they like the person picking you up to be there for the talk because you might not remember it all after sedation.
I found the prep beforehand the worst part but my sister had one just last week & said she was OK with that. Her procedure was done in a different hospital to mine but was almost the same in the way everything was done.
The staff were all lovely & I felt very well looked after.
Good luck with your procedure.