Unfortunately, most VW techs didn't want to work on Eurovans at all. Lucky for me, my wife wanted a Eurovan so I got a 93, same engine as yours, and have since had 5 and still own one.
Is the whole harness removed from the engine, or just portions of it? I have done the heads before, and you have to take a good amount of the harness off for that.
I don't think there is anyone who can do it with their eyes closed, but it just takes some time. The harness has TWO main sections, and they come from opposite sides of the engine- and for some ungodly reason, they then cross over to the opposite side, by routing through the curl of the intake manifold. One you get it into place, most of the connectors match up reasonably well, due to the harness lengths being just enough for the connector to reach with just a little slack, and each sensor or connection having a different shape or size, or slight differences like small tabs out the sides of the connector that match up with the plug. So it is nearly impossible to plug the wrong connector on anywhere.
The section of wiring that comes up from next to the dipstick is a common problem area, as it goes behind the starter, and takes a sharp bend.