Who do you usually call to tile a bathroom and how much does it cost?

Ok, quick question. I want to rip my tub surround down and put in tile just in the bathtub area. The rest of the bathroom is drywall and in good shape. The three sides of my tub are 89 inches high and 59 inches from wall to wall. Could anyone give me a guess on what it would cost to do this and who to even call? I dont know how to rip the tub surround off without damaging the drywall behind so they would have to do this as well. Thanks