Sound deadening, Carpet, and floor pan repair questions

Poke trough the seat belt holes and other bolt holes you will need when you do it. Maybe even leave a bolt in them so you can find them. I didn’t & it is a pain later to have to find all of them.
I absolutely destroyed the carpet around the holes because of some previous bad installation. Magically the previous owner missed one of the holes (installed at the factory) in the passenger side of the transmission tunnel when he installed lapbelts. So there was just a hole. He cut the holes in the carpet way off so there was a pulled up section. Instead of just putting the hardware outside the carpet with a small hole for the carpet like I've seen others do. bad... just bad.