Hi Kila720 and welcome to NICO Club!
You can use the Factory Service Manual (FSM) to get wiring diagrams and figure out how things are supposed to be from the factory. Here's a link to the closest one I could find:
http://www.nicoclub.com/service-manual? ... e%20Manual
I don't think you can purchase assembled interior wiring harnesses for your truck, but I don't know for sure. Have a shop do the wiring for you? That sounds expensive and like it will result in that many more extra wires being installed and bypassing the existing wire mess. I'm not sure that's a good idea, but maybe better than trying to do it yourself. You're best bet seems to learn on your own or make friends with someone who can do it with you. That and working with someone on a forum. Maybe search around for users with the same car and see if you can contact them specifically for some help.