It's been a few months ago since I pulled mine apart. I don't recall if I had to take out the quarter trim panels and/or back seat first. I do know that I didn't have to take out the seat belts.
There are 7 screws across the bottom of the piece and 4 small one (2 on each side near the ends), located on the well liner side. The 4 screws on the ends just hold the guide for the seat belts. The 7 across the bottom are the main ones that hold it in. They also hold the front of the well liner up.
If you need me to I can snap a pic for you of my piece so you can see what it looks like when removed. It'd be in the evening because I haven't been on here during the daytime the past couple of days. I get up, have my coffee and head outside all day to get the final block sanding done so I can my car off to paint! I've posted some info on your dye thread that I just came across yesterday.