I would suggest letting someone do it for you. In my case they added to the foam as it was a bit worn and needed to do this to fill in the new material to make the leather look tight. Just my opinion but there is a time when you surrender and let someone else do it. Here is a video of what I did. I love the results. Btw it was $450 for the install
https://youtu.be/ETgclSHpuTM