While it sounds like this is bunch of stuff to do, it's really not. And it's all basic stuff. Techs pull seats and remove trim all the time. And there's nothing special about the gen5 rear interior. It's basically the same as any other regular modern Toyota/Lexus sedan/hatchback/small SUV. And the wiring is just unplugging a connector and plugging both of the ends into the new sub-harness. The trickiest part is just laying the new wire in the correct spot and zip tying it in the correct locations. Because I'm going to be waiting at the dealership, and because I've pulled the rear seats before, I think I'm going to do all the prep work. Pulling the seats and trim so the tech just has to run the wiring. Whether I do it will depend on the temps Wed & Thurs. We've been having a heat wave with high humidity, so I haven't wanted to do any work outside. But that heat wave is supposed to break later this week. (my appt is Fri morning)