Yaris Towing 1000 lbs?

[CB Spoolmak]

My Car: 2007 Yaris Sedan, 22000 original kms (senior couple trade in), mint save for the crappy undercoat some genius @ a dealership applied. This should be my ride for the next 10+ years unless I win the lottery.

Wiring harness: T One harness for Yaris sedans, plug & play except for a hot wire that connects to the battery.

My quandry: running that hot wire inside the car along the drivers side w/the factory harness means removing interior trim pieces to get to the factory harness path. Or running the wire out a trunk grommet & along the bottom of the car. Judging by how my Yaris is built,wires go inside the car until they reach their destination. My OCD & my gut tells me I should run the wire inside too.

My concern: If the amount of time it took me to remove the hard plastic threshold from the trunk latch area is any indication (two external pushpins, easy, EIGHT hidden death grip plastic fingers/pins) , I will be running out of swear words before I get the first interior piece out. I have stared @ the interior section of the service manual (microimage link) & am unsure how much interior I will have to remove along the driver side to get to the harness. I have removed the two fuzzy trunk liner pieces ( 5 push pins each, EASY) & I can see the wiring harness disappearing into the forward cabin on the drivers side. I have looked through a few interior/audio threads & saw a few pics w/all the interior out which I don't want to do if at all possible.

My time frame: I have all winter, my yaris is on blocks in the garage. I can take my time to do it right, no excuses!

My frame of reference: Last car I removed interior pieces from (everything but the head liner & dash) was a Datsun 240Z in the eighties. Lots of exposed pushpins or phillips screw heads w/a few hidden alignment pins holding everything in, barely.

My questions: Is the wiring harness just behind the carpeting along the inside of the door jam?

If I remove the front & rear driver side door sill plates (7 & 9 deathgrip clips!) can I get the carpet back to access the harness enough to fish the wire through or will I need to remove more plastic like the wheel well cover next to the back seat and the pillar cover directly below the front shoulder belt.

There seems to be interior differences between the hatch & sedan. My sedan has full plastic trim around the rear seat support frame adding complexity to removing the seat. Can I get the those rear side trim/wheel well pieces out without removing the rear seat?

When the factory manual says something like "disengage" (LOL) the panel pins/clips they mean sliding a putty knife or screwdriver under an edge & work painfully slowly to get the first pin/finger to pop & try not to destroy the panel in a fit of impatient rage because all the little plastic fingers/pins don't want to let go, correct?

This should be a poll: outside, path of least resistance, git er half arsed done, or inside, path of sorrows, but I will be able to sleep @ night because it makes sense to do it this way?

If you are still reading, Thanks in advance for all input!