Our intention was to install the Stiffenerz in our driveway, but problems with our welder, not wanting to weld on our back (no leather welding jacket), and looming deadlines sent us looking for help. We took the Jeep to Off Road Evolution instead. We had thought it would take a couple of hours, but after grinding to bare metal and a whole bunch of welding and cooling cycles, it was about 61/2 hours from start to finish, with at least half of that being actual welding. It was stitch-welded on the ground (we put it in the air for better photos), 2 inches on, 2 inches off, all the way around the stiffener. You will probably need longer bolts if they pass through the stiffener, so plan accordingly. We didn't. Fortunately, the shop had bolts on hand to replace the stock ones.