My donor was a 2.0L Ghia with fuel injection and ABS so I think I probably have the most bloated wiring loom in existence. Took me nearly a day to strip the various parts from the car and lay them all out, then another day to separate everything. I've pulled the loom completely to bits and removed all the unnecessary wires - some things like the indicators were bundled together with the power windows and central locking which I don't think I'll be needing.
After stripping out the bits I didn't need I taped it back roughly together to keep things tidy.
I'm not at the stage of putting it into the car yet, but like most things It's just a case of being methodical and checking everything as you go along.
I do have an electronics background though, and many moons ago spend a couple of weeks on a course that taught how to build looms to military spec so regard the wiring as one of the simpler tasks.
Matt