Unwrap the tape and loom from all harnesses, unplug them, regroup them so the wire bunches are smaller and untangled, then put the rear portion of the harness through the strut towers and the front portion of the harnesses through the headlight/bumper area.
http://www.soniccherry.com/wires.html
I put the main wiring harness under the pinchweld. Others put it behind their dash. Basically unplug everything, take out the dash, and run it behind there if you want to go that route.
The solenoid is directly underneath the driver's side framerail and all the wiring was run either underneath thru the headlight area or right under the strut tower from the bottom and then back up to the solenoid. It's easy, just time-consuming since you have to basically rewire everything.
The good news is, it's near impossible to mess anything up, so at least you don't have to worry about that.
Once you have them regrouped and in smaller bunches (in stock form, the wire groups are made up of numerous wiring harnesses all tangled up together, which adds thickness) you can retape them and then add some loom. I wrapped them 100% in electrical tape, then added loom at the point where they left the engine bay.
The headlight harness was put in front of the framerail, out of sight. I cut and soldered it all back together, it was easier/quicker than taking the fenderwell out again to gain access to unplug it all.
Edit: Took maybe 3-3.5 hours to do the passenger side and about 4-4.5 to do the driver's side. The solenoid slowed me down, the wiring can get tight and I had to come up with a few ways to redo it so I had enough slack. I didn't want to have to add on extra wiring and splice, etc. Keep in mind, this was with stripping all the old loom and tape off, retaping/looming, and degreasing all the wiring that was had 12 years of filth and grime over half of them. If you did it quickly and not at neat, I can see it being done in a couple hours each side, depending if you want to leaev any signs of wiring at all in the bay or not, really.