I was banded in October in Belgium. Procedures may be different in the US, but this is what I experienced if it helps...
I'll skip all the booking in and waiting ...
First of all, when I was being wheeled to theatre on my trolley the thing that kept going through my head was 'Am I really doing the right thing here?' and 'Has my liver shrunk enough?' I'll be honest, I really wanted to jump off the trolley and run away and forget the whole thing, but now looking back, I'm so glad I went through with it. Just remind yourself why you are going through with the whole thing.
Second ... If you have never had an operation the main thing to rember is not to panic. Just before I went under I remember feeling drunk as hell and my skin started prickling. I got half way through asking what the hell was going on and the next thing I remember was waking up post op and feeling freezing cold although they soon warmed me up.
When I came round there was mild pain, but I won't lie to you here ... it got worse ... although never unbearable, but as the drugs wore off the pain definately increased. The main pain was at the port site.
I spent one night in hospital under observation, then one night in a hotel. The most painfull part was again the port site. Sitting up off my bed was hard work. To stand up I had to sort of slide myself off the side off the side of the bed and ease myself up. The next day I traveled 100 miles home by train and this wasn't too bad. However, if you are thinking of driving after your op forget it. It is not safe.
I have a physical job and I took about 10 days off work. By the time I went back I was fairly comfortable as long as I didn't lift heavy weights. From what I remember, I couldn't lie on my side for the first week, but that gradualy got better and looking back on it, it was only a short time of inconvieniece. The main thing is to take it easy. I did have gas pain in my shoulder for quite a long time (3 weeks or so), but this was not really pain, just a pain in the butt when it came to sleeping on my side
As to worrying if your liver has shrunk enough ... I was told to do a 7 day low carb/low fat diet before the op. I'll be honest here, I only stuck to it for 3 days and worried about it more than anything else. My doctor told me AFTER the op that an enlarged liver is extreemly rare, but the diet is worth doing just incase. After all, you don't want to be that extreemly rare case do you?
Sorry for the wall of text. Hope some of what I have typed helps. It's natural to be worried before an operation, but in a month you will look back on it and think it was no big deal and be happy you went through with it.
Good luck!