Replacing the engine wiring harness

[40BelowSummer]

I have a car at a shop and they are not advanced enough to diagnose a short I have with a 5 VREF circuit.
I just ordered a new wiring harness and from memory it looks pretty easy to replace....I dont think the intake needs removed or anythng like that.
I already have the ECU exposed and I'm hoping to change the wiring harness in a parking lot.
Does anyone know or can take a look how straight forward it seems? The ECU connectors will fit through the firewall with not much of a fight etc?
Any insight appreciated thanks

 

[Autox4fun]

Restringing the new harness should move smoothly, but take pictures of locations, this harness goes all the way down to the steering rack.
I, on a 10-12, just had a cam phaser issue and ended up being a broken wire at the front (radiator side) cam phaser connector, was an easy repair.

 

[40BelowSummer]

Restringing the new harness should move smoothly, but take pictures of locations, this harness goes all the way down to the steering rack.
I, on a 10-12, just had a cam phaser issue and ended up being a broken wire at the front (radiator side) cam phaser connector, was an easy repair.

Thanks for the reply! Yes it doesn't look too bad now that I see it. ***** the harness is on national backorder though. So I may just pull the old one and see if I can find the issue or fix