ok, so I purchased this harness off Aliexpress. Delivered for under 50 dollars. I took off the door frame insulation and pried off the side panel. There was a harness zip tied to a metal frame that sat in the way of my hands, so I had to temporarily move this harness aside by cutting the zip ties. Removing the original plug was easy enough once I got a feel for where the plug actually is; the plug itself is not directly behind the actual ISG Button. The plug sits pretty much centered between the ISG button and the button next to it. I didn't really discover this until I tried to plug in the new harness and couldn't figure out why I couldn't "feel" the new plug into place.
I ended up prying off the faceplate to get a better look. I didn't fully remove the faceplate because I noticed there was a little bit of adhesive on the inner half of the faceplate where it sits near the steering wheel (if that makes sense).
Anyway, by prying off the face place I then realized where the actual female portion of the plug sits, and from there I put the faceplate back into place and then wiggled in the male portion of the new harness.
if I had to do this over again, now knowing the actual female side of the plug doesn't sit directly behind the ISG button, it would be much much easier for me to install.
If you choose to pry off the face plate, I recommend putting some painter's tape on the silver portion surrounding the faceplate since you'll be prying the plastic tool against this silver frame to get it off. It is held in very tightly with clips.
The installation can be done by just removing the side trim piece as seen in the youtube video, but if you have large hands it's not going to be an easy install. Have someone with smaller hands do the work.
One thing I realized is this harness has no memory. This harness always defaults to turning ISG off when you start the car. It does not remember your last setting, so if you happened to turn on ISG on your last drive and want to allow it to operate again on your next drive, you will have to now turn it on when you next start up your car.
I had purchased a different harness for my Palisade and that one has a memory to default back to your last setting. That harness cost me almost twice as much as this Aliexpress harness, and I'd rather pay less and just know that the ISG feature is always defaulted to OFF when I start the car.