I had a pre-cancerous cervix and I think I had that done. (It was a long time ago.) I don't remember it as being that bad. I DO remember that later, my serious Asian Doc wanted to take a picture of that area (talk about feeling weird) He assured me the photo was for my file and wouldn't "go anywhere". All business and very serious-like, until he got ready to take the photo. I told him, "Tell me when to smile!"
But back to the procedure. I think it sounds worse than it is. Anticipation can be horrid. Try to keep busy with friends & family so you don't worry too much. Good luck & let us know how it goes!