Define "dumbest of the dumb". I think a skill level should be applied here.
Courtesy lights
Dome lights
Brake, tail, turn, reverse, and headlights
Wheels
Visors
I'd classify those as the easiest things to do. Simple remove and replace.
I've had ZERO formal training and have picked up tips and tricks by watching guys at dealerships and online or simply figuring it out myself. I'd consider my steering wheel swap, to date, the hardest/scariest thing I've done. Not only did it have danger potential to myself but it had the potential to **** up a number of things in my car, lol. Removing my resonator was probably the next hardest.
I haven't done it in this car but ive removed/swapped seats and it was a PITA. Removing the HVAC components weren't too hard bjt it required some finesse. Same with swapping LEDs. The radio isn't too hard.
Different people consider different things to be harder or easier than others. If you've done it or know what you're doing, a steering wheel swap is relatively easy. But for someone who's never done it or has little to no experience, it could be scary.
