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The ONLY bit that is hard to access is the plug into the wiper motor. it's concealed underneath the motor which is in turn buried deep in the bulkhead. You normally have to remove the motor to get to it, which is not the most fun in the world, especially replacing it with small washers falling out everywhere. I have seen (rarely) a small sub harness that plugs into the motor, about 6" long which then takes the plug onto the loom into an accessible place. But it's not common, don't hold your breath!
Everything else is pretty much plug and play. Though if you aren't familiar with the layout probably best to to mark/label the old loom as you disconnect it and match the labels to colour codes on the new one.
Excluding the wiper motor, I can change a front loom in little more than an hour, but i've done a few. Realistically, expect to spend a day on it.
Steve
To be honest I didn't find that to be much of a problem, I've got pretty good at unplugging things blind and by feel after working on some modern cars with poor access. Generally I can't be bothered moving things out of the way. Compared to some modern connectors, disconnecting the wiper motor was easy.