I replaced mine for first time, didnt label anything, didnt need to. For the most part the engine harness can only lay out one way. Removing the trans with it I think is easier than just the engine. It's quite literally 2 connectors on the parking lever assembly, 1 at the top of the trans, pop the axles and remove either the 4 bolts on the side of the trans or the 2 bolts at the bottom of the trans mount, and 2 connections at the radiator.