We photo document everything in the car, we then cut out all the wire at the connectors and go to town........the nice thing about a GM is they really didn't change much over a lot of years
If you have lots of aftermarket items in the car, you should wire them in on the bench, it will make things alot easier. I usually use fuses for different things if those options are not in the car and relabel things.
It's also good to get a good book on vehicle electrical wiring if your skill level is questionable, it can help to understand how to do things and why certain things are done.
If you can use new connectors, do that, at least replace the pins in the connectors, that way you leave nothing to have issues again.
I would also recommend soldering and heatshrinking everything you do, that way it's going to last alot longer and less chance of wires falling out of connectors when running cables.........
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