Drivers Side Floor Pan Replacement

So, I’m about to do some major surgery (for me) on my 67 Barracuda Vert and any advice or pointers would be greatly appreciated. It seems when I parked the car in my folk’s farm machine shed for ten years that the drivers side floor (front and rear) suffered some severe rust rot. I’ve acquired a replacement pan through Summit and am going to attempt to replace it myself. A few questions come to mind right from the start. Should I remove the torque box or cut around it? Do I need to tie or brace the door opening prior to removing the floor? What is the best way to match the removal and replacement? Has anybody documented (with pictures) this rather invasive procedure (removal and replacement) and if so, would they be willing to share? I’ve currently removed everything from the car except the rear axle and convertible top which is retracted into the boot. Thanks in advance.

Mark