Drive this truck. Fix what goes drasticly wrong, and drive it some more.
Everyone is right so far. We have all looked at a project truck and tried to calculate time and money and it seems impossible. (This is not a good thing to share with your wife)
Move forward and do something that will make you smile. Clean something till it shines even if it is only the mirror or the radio buttons. A little glitter will make you smile every time you notice it while driving.
Read the stuff guys post here often. Make this a place that you get your encouragement from. Lots of guys are working their way through the same problems and some may even have less skill than you.
Drive it.