When I changed my seats recently I just took the two bits of plastic trim (One torx screw each) off either side of the seat, undone the 5 nuts(13mm) holding chair down, unclipped a few wires, and repeat in reverse to put back in. Nuts come off so much easier than ones under the car. Less than an hour to do both and was in the dark with a torch as I ccould never find time in daylight hours.
Will