I'm sure you have looked at the pictures in the thread. The wheels fit fine, just clearing the caliper by the thickness of a credit card as they say. I've been running these wheels for over a year and had no problems. My tires are 255/55 r18, which is a little smaller than the 265/60's you have, but I think they will fit. Stock size for an 18" rim is 245/60 r18 if you want to get new tires and be in spec. If I were you, I would mount a wheel with tire on the front and lower it and turn it all the way to the left and to the right while lowered back down. If nothing rubs at lock to lock or withing suspension travel range, you are fine. There is no substitute for doing things yourself, but IMHO from reading other posts in the past, I think those should fit without seeing them. As for TPMS sensors, new ones retail for $115 online, but they may have a newer frequency that can be quirky for some people, but generally works for others. America's tire rebuilt my old ones for like $25 ea. and I've had no problems. Some folks don't trust the rebuilds. I figure if the rebuild fails, I'll check the tire pressure the old fashioned way, I carry a tire pressure gauge whether I need it or not. Also, I live in California where there are lots of tire shops competing for my business, so if I smell ignorance, it has a distinct odor of BS, I politely move on till I find a shop that knows what they are doing. At $50 ea a rebuild, that sounds high, but it's less than $130. Personally I'd save the $80 difference and carry a tire gauge. Ask them what they replace for the rebuild, it should be any rubber pieces & battery I would assume, what else could go wrong? Programming the sensor sounds suspicious to me because unless they have the wrong sensor, the computer will automatically detect and read the new sensors with 10 miles (usually less than 1 mile for me.) Also, tire shops like to over inflate the spare so it doesn't go flat. Insist that all the tires, including the spare are inflated to the same pressure or the computer will get confused and either won't read the tires or give you weird readings (it told me that my right front had no pressure for example). Good luck and don't forget to post pictures for everyone when done.
And regarding Pepboys, they are just covering their butt when they say "It might not fit." With years of experience in customer service, there is always some crazy customer who wants everything to be guaranteed, but for a budget price with used parts. They are just protecting themselves.