It really wasn't hard at all, I had it done in about 2 hours,. minus the prep time of getting the leads ready, that was a couple hours... I bought (4) OEM GM leads off of eBay. P/N 12085535, or you could get them from @pgamboa Harness Dr.. I rough measured from the mounting location to about the gas pedal area, cut some 18 gauge wire (red/black), and heat shrink butt connected them to the GM leads then wrapped each one up good in harness tape.. I mounted all the lights (there are factory mounts in the trucks, except for the passenger seat, it's not a power seat) , I then ran both back seat light wires under the seat rails and up along the inside edge of the console. I took both passenger and driver's side light leads and ran them up to the front of the console up by the console mounting bracket..
I cut back all the black leads and terminated them with a 10mm electrical connector and mounted the negative to a dash mounting bolt that had enough bolt threads to get the terminal, lock washer and a nut on.. I then cut all the positive leads back and connected them all together. I took a piece of wire long enough to reach from the BCM to under the console. Butt connected all 4 leads to the single lead and wrapped that up good with harness tape. I used a T-tap on the violet/green wire in the video and ran the line to that...