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The harness passesses thought the opening of the intake manifold, if I remember correctly, between # 2 and #3 runnners.
Use that point as your "middle" of the harness and disconnect each "end" and work it back p to that point.
What I mean is, the right half of the harness runs down under the engne and includes connectors for various temp,knock, water and oil sensors, plus goes over to the alternator.
Meanwhile, the "left" half of the harness passess through the firewall and connects to the brainbox in the passenger footwell.
therefore, pull each end toward the center like you are going to lift the darness right up out of the engine.
And I recall not needing to unbolt the intake manifold this way, but the suggestions to do so and complete other maintenance at this opportunity is a good idea.
Also, It's a good idea to have a second car nearby as a reference. Marking each connector on the old, then the new harness is a good approach, although the wire lengths and connector styles pretty much let you know what goes where.
I bleieve it doesn't matter which injector wire gets onto which injector. there may be differing wire lengths, which is to suggest which wires will "reach" to the front or rear positions.
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