surgery

i was dinosed with diverticulitis 4 yrs ago and had been to the doctor office just about every month with servire pain from this and been bothered even the time i havent gone to the doctors . i alway eat what i supose to and keep the diet right . but i still  keep having pain anyways, they have done a colenopspy on me 2 x and now im going for my 3rd and then they want to surgery on me. they said it would help since i mall ways in pain every month. i eat plenty of fiber every day. what i want to know is what would be involed in this on having the surgey?