I had my right hand done via endoscopic carpal tunnel surgery in October. Not too bad actually. 2 little cuts, each about half an inch long, one on my wrist, one in the center of my palm.
The pain after surgery wasn't too bad, if anything. Just an occasional bit of pain. The first few days after surgery you won't be able to use your hand at all. I couldn't pick up a napkin the first 2 days. You start to get a little more strength back every day. I'm still not 100% yet, when I pick up something heavy it still hurts a little. My suggestion, wait about 4 months before you get the other hand done. It's not that bad, but it sucks not being able to use your hand.
I'm right handed, and it sucked not being able to use mine. That left handed butt wiping was a bitch.
Good luck...