The plan is to attach this pad to the upholstery with quilting seams. I get to work, cutting the pad into the basic shapes in my sewing room.
By the way, cutting a furniture pad with scissors makes a guaranteed blister on you hand, thereby increasing the joy with which you approach the rest of the project. NOT!
I cut the pad to fit the surface that you sit on going to the edge of the seat on the bottom. Then as it goes up the back of the seat, I follow the surfaces going up and over (under the head rests) carefully marking where the knobby things are and the corners.
Next, I get to work hand basting the upholstery on top of the padding so I can later roll it to allow sewing the quilt lines on the sewing machine. This is where I discover that needles do not like to penetrate a thick pad and upholstery material. I even have to grab one of my Grandma’s thimbles to save my fingertips after a while.