8th gen

Okay, I've read a few threads and have seen the "just trade it in", and "just sell and buy an M/T" responses. But just for intellectual curiosity assuming I have all the money and tools what would I need and how would I go about swapping an A/T to an M/T?

My headliner has been sagging for a while now, all adhesion is gone and it has just gotten worse over time. I have a 2011 Coupe LX and when I called upholstery shops I was given estimates of $700+. So I am curious if anyone knows any DIY fixes or how I could go about fixing the adhesion. Or any...