I used 3M's compounds when I used to paint and buff. Step 1: For black I did 3M's white wool pad with their white top cutting compound at #2 speed on a makita buffer. Step 2: I would go to 3M's yellow wool pad and same thing as white but its softer and less aggressive and kills the swirls, and not a quick process, I do the yellow twice. Step 3: 3M's black foam pad with 3M's black top swirl/polish compound at 1.5 speed on buffer, keeping as flat as I can and slow left to right motions, do in sections and take your time don't use too much at once and buff till compound goes away on its own. I do this twice as well. Step 4: 3M's blue foam pad with 3M's blue top polish compound and 1.5-2 speed on buffer and slow back and forth motion. Now when wiping down with microfiber only straight lines no circles and once you make a wipe switch sides of microfiber or you'll see tiny sand like scratches.
Very anal process for Black and some other dark colors, light colors you can cut steps out. I do not have any videos from when I used to do this, sorry. Any questions feel free to PM.
Wet sanding I do 800-1000 grit with a soft block or paint stick and then 1500 grit to 2000 grit to 2500 all the way to 3000 and 5000 grit.
I use the 3M quick disconnect adapter and then their pads and compounds. So pad swaps were quick.