Porter Cable orbitals are pretty user-friendly. Not as powerful as a rotary on tough scratches and swirls, but easy to use.
I find I get my best results by applying the polish on Speed 2 or so. Once I get the polish spread out, I crank it up to nearly 6. I work slowly, maybe an inch or two a second, and go in both directions. Wipe it off with a good microfiber towel, and move on.
Once the polishing is done, some people use the PC to apply wax/sealant.
Since you will be getting a new 135, the PC should be all you need. If you wash and dry with care, you shouldn't ever need more than the PC.
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