1967 c 10 build
 

Hello,
My names Eddie, changing out entire floor pan, also needs cab corners, wich one 1st? Where to brace for floor pan disassembly ? All parts are in, i just know there's a right way and order as well as the rong way ... do i cut out cab corners and weld in new ones 1st, or start with the full floor pan replacement 1st? Any help would be greatly apreciated, thanks.