one-pieces (like mine...the sport buckets i think) should be easier if you can get the upholstery off. You'll need to anyways to run wires. But with these seats, it's simple: you just need to run wires up into the seat from anywhere. Once you know where your cut out will be, cut an "X" connecting the opposite corners. then pull the wires thru the opening. I've never done one before, but saw a complete write up out of a "Truckin" mag I picked up last summer. I believe they had photos and write ups from at least 2 or 3 headrest installs. But unlike with BlackMagic's 2-piece seatbacks, you don't have to worry about tracing wires down the puny little uprights.