I had a complete tear in my left cuff, and had radical(read cutting) surgery to repair it. I knew from previous experience with arm injuries, that the recuperation process would take a long time(a year or more), and that there would be pain involved. Time proved me correct.
The first thing I did to ease my discomfort from the surgery was to start sleeping in my recliner chair. I did that anyway sometimes, but not usually all night. This kept me from turning from 1 side to the other during the night and putting pressure on the surgery site. It helped a lot.
Next, when you start PT, do everything they teach you everyday without fail. If you don't, then you will never recover your strength and range of motion that you had before. This MUST become a daily routine! Increase your repetitions and amount of weight until you can do 25 of each excercise. Then, increase them again.
It has been 1 1/2 years since my surgery and I still do my excercises each day and sleep in my chair every night. Without this routine, your muscles will atrophy very quickly and then you have to go through the building-up process all over again. It takes a long time to recuperate and no time at all for your hard-earned musculature to disappear. I am still gaining strength, but most importantly, I am gaining endurance. I can now shoot rounds of trap singles(100 birds) and trap handicap(100 birds) without tiring and my average is inching up. Without the surgery and rehabilitation, I wouldn't be able to lift a shotgun, much less shoot it.
Good Luck with yours!