Welcome to the site! The people on here are very friendly and supportive.
Tips:
If you're not off caffeine yet, do it immediately. You don't want the caffeine withdrawal headache on top of surgical pain.
After surgery, sip,sip,sip,walk,walk,walk. These make a HUGE difference, really.
Rest while you can. The Earth will continue to rotate if the laundry gets done a few days late. Be kind to yourself. This is major surgery and your body needs to heal.
Ask for help if you need it. Don't try to do everything yourself.
Best of luck with your surgery and I hope you have a speedy recovery!