I put a cdc-mp3 in today, got it from Crutchfield, everything that was needed was included except for a way to splice the harnesses. I wimped out and bought Butt connectors, since I didnt have soldering iron. Followed the directions, no sweat, took a couple of hours.
I called the tech line once about a week ago to ask a general question, about putting on the backstrap, I was on hold for less than 5 minutes, and talked to a guy that sounded like he knew how put a stereo in. I was impressed. He also turned out to be correct, there is just about no way to put a backstrap in a 91 ranger without dismantling more of the dash than I care to do, and it works fine without it.
About the only thing they could have done to make it easier would to have been to attach the wiring harness kit to the radio for me, and that would have only saved me 10 minutes tops.