[TboneS54]

Medium. Most amatuers would say hard. You won't be making much progress with a d/a, foam pad & diminishing compound, let's just put it that way.

I think new cars are barely coming with 4mils. But if it is new, then there shouldn't be much correcting to do. I'd say paint hardness is inconsequential. Just get some polish and soft/medium foam pad and clean up the light swirls/holograms/etc. Leave as much clear as you can.