Welcome to Autopia Nytefog!
Good advice. A professional detailer needs a direct drive power buffer to deal with a much wider array of paint flaws. However if your vehicles are in "good" shape then a PC will make them better with much less physical effort than trying to do it by hand.
Personally I like the PC best for applying FI II, SMR and AIO. I generally wipe off the residue by hand with a MFT.
To get rid of swirls and light scratchs you want to start with the mildest abrasive. Only if the mildest doesn't work will you need to go a step more abrasive.
Lighting can make a HUGE difference in what you can see. Try to work under flourescent or halogen lights. That way if your lighting is constant you will be able to make a more scientific comparison of different products.
When you get to a level of product that removes the scratchs then use that product followed by the next mildest and the next mildest. For example if you had to go to the bottom of the list to remove your scratchs, you would then work your way up to the top, before waxing or sealing the finish.
I like 3M Products for tasks like this because they have a graduated scale of abrasive products which will allow you to choose the right product for the job. The first item the SMR is not classified as a rubbing compound because it is so fine and it has the added benefit of leaving a very smooth glazed looking surface.
From mild to abrasive here's a list of 3M's products.
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