Hi - it may depend a bit on exactly what they are doing - are you have a hookwire?
I know just how you feel, I really don't like no knowing..I was so nervous in the lead up to surgery but once I was there it got a lot easier. The nurses are always so helpful and definitely just be clear if you are feeling worried and they will take care of you. They gave me a warm blanket just before going through as I was a bit nervous and teary, it was like a warm weighted blanket which helped to calm my nerves.
For me, surgery day was a lot of waiting, even though I was overnight I found i was treated more like a day patient...lots of moving from waiting area to another, and I didn't get a room until I was in recovery in the late afternoon (although I had a hookwire so had to spend some time in SKG section). Make sure you have a good book/podcasts/music/whatever entertains you!
After the initial check-in, I went to get the hookwire - so was in my clothes on bottom and then a hospital gown and dressing gown on top, then later just before surgery I was given a proper hospital gown and had to remove other clothes, go to the toilet one last time before I was wheeled on the bed up to surgery section. In the theatre I scooched myself over onto the operating table and then the anesthetist put the needle in and I was gone!
When I woke up from the anesthetic I had a lot of things attached (blood pressure monitor, oxygen mask, Iv drip, and electric leg compression stockings that inflated/deflated and a sub-cut pain med pump), these were difficult to sleep with but gradually got removed one by one (I had low blood pressure so needed to be monitored).
I made sure I had my favourite comfy clothes (even though I didn't put them on until hometime), headphones, kindle and favourite chocolate bar for the next day!
By mid-morning the next day I felt pretty good but a bit wobbly. Pain was minimal which I was surprised about and was able to move around pretty well over the next few days with just a bit of light-headedness.
Hope that helps xx