Good luck.
I had one recently. I was surprised at how long it all took, actually. I had to be there at 7am as is usual, and I was second on the list, so went in about 10.45 as expected. I then saw the clock in recovery and it was 3pm! I could see from my notes afterwards that I was having the anaesthetic drugs between 11 and 2.30, though I have read that the surgery itself is usually 30min-90min, so there must be a long time of getting you ready and waking you up. Or the surgery was a bit slower than expected for some reason - she had a registrar in with her so maybe there was a lot of teaching happening or something, not sure. But it felt like I'd lost a couple of hours, which I hadn't expected.
I had a nerve block as well, which carries on after you wake up, and is really really weird. They put the cannula in first, and I don't remember anything about the ecg leads, blood pressure, tube, nerve block injection or anything, so that must all have been done after I was asleep I guess.
Tell them if you feel sick or in pain as you wake up and they are really good about getting the drugs into you asap.
You might have a bit of a sore throat after.
Be prepared to sleep a lot for the next week or so - it really took it out of me and felt a little like jet lag almost, even from a short operation (obviously some of it is the healing process as well). But I'd suddenly get overwhelming sleepiness during the day.
Hope all goes well!