As you can see, the hardest part of this repair is removing the seatback. Good attempts at describing above. Obviously, the seatback has to come off from the bottom up. I used a thin screwdriver to get the vertical plastic strip started out of the channel. Once you have it started, it is easy to see how it is held in place. As G-Benz said, the tension of the leather spread across the upper seat is what holds it in place. If you can, have someone squeeze one side of the seat in with both hands while you pry the plastic strip out of the bottom of the channel. Let us know how you do. There is really not much force required to pull the seatback off, so your back should be fine.