i am an electrical engineer, so i do not find wiring to be intimidating at all - i actually enjoy setting that right. In fact if you were nearby, i'd rewire your truck for you. A good harness will come with a diagram, color code, point-to-point routing chart, and circuit function description. Use some tape to label the wires. Grab a handful of colored highlighters and cross off each wire/circuit on the wiring diagram as you complete them. Rewiring my truck was one of the most enjoyable parts of my restoration.
i got my harness from this outfit:
www.lectriclimited.com and i was very happy with it.
you'll be fine - have confidence and you will be proud of your results!
