Keith, we all have faith in you, as I can tell your dad and wife do. We know you'll get it done. Now you just need to convince yourself that you can do it. You've done a good job so far, so I don't see any reason you wouldn't be able to complete the job, except your own negativity.
Just keep going. Try not to get discouraged and keep your goal in mind.
I'll suggest one more thing. Get close to where you think you need to be, then assemble the truck and go over it one last time to make sure your body lines line up and your panels fit well. I've seen a few projects where the doors were finished off the body of a car, and one of them didn't line up. The gaps looked great but the lines were off at the front of the door. The earlier you're able to catch this, the less work you'll have to fix it. Thankfully I learned from someone else's mistake, and you can too.