A lot of good advice and experiences here I can relate to. I would like to summarize my thoughts in the following points:
1. If you don't have the passion and are in it for a financial investment, then call it quits, sell the truck, take the loss, and invest in something else. This isn't for you.
2. If you have the passion for this, you will never call it quits. Sometimes you may have to take a break. Know yourself and what motivates you to get the fire lit again.
3. Do a little something everyday and you WILL consume the elephant.
4. A running/driving vehicle will keep you more motivated. Keep it in that state as much as possible.
5. Organize yourself. Make a list of what needs to be done to get it on the road and focus on those things one by one.
6. No one is born knowing how to do this stuff. If you're not experienced at this and are frustrated because you don't really know how to do a lot of the things that need doing, see point #5 and just learn how to do each thing at the point that you need to know it. This is called "just in time" learning. Pretty soon you will find that you know a lot of stuff and can apply the knowledge to other tasks as well.
7. Turn to your Stovebolt brothers and sisters for advice, when you need it.
8. Keep in mind that when it runs and drives for the first time, you will hear angels singing and you will joyfully realize that a miracle has occured.
9. Once #8 occurs, you will never be the same and will spend the rest of your life looking for that high again. Yes, it's a disease. Welcome to the club. You're screwed.
10. Now repeat these words at least 10 times: "It CAN be done. It SHALL be done!! Not rust, seized engines, missing parts nor rounded fasteners can defeat me. I am prepared to die with a wrench in hand, if necessary. I shall never surrender."
Now, this therapy session is over. Are you ready to get out in the garage and get that thing so that it will run and drive? OKAY THEN!
It's time to focus on specifics. Where are you right now on this project? Maybe we can help you determine what next steps you should take.