long time no speak- hope you're well.
I'll concur with the lads, you really need a "proper" machine polisher not a mickey mouse Amazon thingy.
A DA sander is great for the bodyshop where you want to take down the paint surface for prep but for polishing you really need something like a Stork machine which has plenty of torque and a slow speed that doesn't burn the paint surface.
I'd spend the time hunting on fleabay for a bodyshop polish machine rather than a retail polisher, You'll need a couple of different heads and then browse the 3m range or Farecla- use an old squeezy bottle with water to keep the head and panel cool, a small area at a time not more than 2ft square (old money)- start on the boot first to get the hang of it and definitely, as has already been recommended, watch the You Tube clips.
See you at Monterey !