I had a miscarriage from an incompetent cervix august of 2007. So this pregnancy I had to have a cerclage placed at around 14 weeks. It wasnt so bad. I mean I was awake for the whole procedure and I had to get an epidural spinal block type thing. You dont feel a thing at all. I didnt know they were even touching me. The longest part is the epidural, unless they put you out. Otherwise a cerclage doesnt take that long to actually put in. Mine took less then 5 minutes. Then you go to recovery. I had to wait until I could start moving my knees a little cuz with the spinal you can move or feel anything below your waste at all. then they send you back to your room and you get to relax there and they normally only keep you until you are able to pee at least once or twice. But you dont even know the cerclage is in there. there may be a little bleeding for a few days after, but that is nothing to worry about. Then it just stays in there til they remove it in the office at about 37 weeks. I still have mine (I am 24 weeks 2 days) and it has been working great. Nothing has gone wrong and it is holding very well. I dont even know I have it.
Good Luck. I hope this helped. Just relax. Getting stressed out about situations normally just makes them worse. I was really freaked out the whole 3 weeks before I had to go in and it wasn't as bad as I expected it to be.