How had is it, or possible even, to take the plugs off of the engine wiring harness without breaking them, so they can be reattached?

 

easy!!! go to radio shack they have little tools to get the pins out called terminal block tools or something they can help you.

 

Its not hard. All you need is a straight pick, and alot of patience. I've already done this once last winter when I did a partial wire tuck. I took one sensor, then one by one took out a wire and untangled it from the mess, then plugged it back in. Then took the next wire on the sensor and did the same thing.... and so on and so on for every sensor. I'm doing it again this year, but the difference is I took the entire harness out of the engine bay along with the fuse box and all the other wiring, bought a complete brand new set of wiring harness' and I'm going to make a custom one from scratch combining both new and old harness'.