Good luck with your surgery, Mike. I had my right one replaced in 2002. Next to marrying my wife it was the best decision I've ever made! It had gotten to the point where hunting and even most fishing was out of the question. Finally, even sleeping was getting to be difficult at best and impossible at times.
Just do what the doctor tells you to do after surgery and you will be amazed at how you feel, and how much better hunting and fishing, etc. will become again. It takes 12 to 18 months to completely recover, so don't get down if it feels like it's taking too long. Mine felt great at 12 months and even better at 18.
Keep us posted on your progress.