Well, by now you've probably had your surgery, so I'll skip the advice about nerves. Once you're out, do everything the staff tells you to do; sip, sip, sip, walk, walk, walk. You will be feeling better in a few days and are now officially on the path to change your life.
As with any journey, there will be bumps in the road but your destination (a new you!) awaits. Good luck.