Mike,
Don't be too hard on yourself, Anyone that hasn't injured themselves or a peice of equipment with a screwdriver just hasn't used one enough times. I believe the key problem is the stripped blind nut? If so, you may want to cut a small access hatch (maybe where the hole is?) Then you can glue some doublers in and secure a cover to your hatch after you repair the nut and install the fuel tank.
John