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I have not done it myself but a buddy of mine put in a complete harness. the one thing he said to do and the main point was to lay out the wiring harness as it would be in the vehicle, preferabbly next to the vehicle. Also label the ends of new wire as to where they are suppose to hook up in the vehicle and then start systematically taking out wiring and replacing with new harness. Hope that helps.
Like was mentioned above, I laid mine out next to the truck and divided the wires into seperate harnesses. Then I only had to run each harness to the terminating area of the truck (rear, right front, left front,engine, and interior).