I just spent this afternoon installing cab lights on my new truck. They look great but it was a PITA to install them. I bought the Ford factory lights and harness, that was the easy part. Taking down the headliner and associated trim was very difficult. I am very picky about how things go back so it spent more time than the average person would have. I can say one thing about the install, it is easier to lay the light holes out from the inside of the cab then it is to do it from the top. I don't have a sun roof. It would have been a litter easier if we had a work platform to access the roof line. Working off the running boards were terrible. Also I drilled the holes the same size as I needed and ended up drilling a larger hole. My advise is drill a 1/8" larger hole than you need and the light will drop in fine. I used a little silicone around the opening for insurance. We also draped a sheet inside the cab to catch all the shavings, this would be more difficult it you dill everything from inside the cab. All in all I pleased with everything and I'm glad I did it.