Good choice with the GG6 and 3" BP. I would also suggest a 5" BP and 5.5" pads. You will get better pad rotation with the GG6 with the 5" pads also be able to work with curvier panels a bit easier.
If you can the Griots Boss pads work great and their compound (Fast Correction Cream), Correcting Cream and Perfecting Cream (Polish) work amazingly well.
If working outside as mentioned heat and residue control will be your best friends. You may need to cut your passes to a smaller 1ft. x 1ft. section depending on how your test spots go. Its not rocket science in the end but there are variables to consider just like with any process.
https://www.autopia-carcare.com/griots-garage-boss-5-inch-polishing-pads.html
https://www.autopia-carcare.com/gr-b3-combo.html
As a general rule of thumb you will want the following # of pads:
1. Cutting pads (White/ Orange) - 6 pads
2. Polishing pads( Yellow) - 4 pads
3. Finishing pad (Black) - 1 pad (usually used to apply wax/ sealant by machine, can be used to finish on softer paints if polishing pad is causing marring)
I will never again underestimate how horrible a finish can be on a new car as I have worked on quite a few "New" cars this year with less than 50miles on them that are a scratched and swirled up mess. In the end its going to be based on how much correction you want to achieve and having the proper maintenance process in place to maintain it even with the coating you won`t avoid all scratches/ swirls.
I think with the Autogeek sale for 25% off right now its a good time to pick up some stuff. I believe if you call Autopia they will give you the same deal as its pretty much the same company)
I enjoy Scotts (Dallas Paint Correction) videos but agreed I take it with 1) I have to do my own research on what is being stated/ shared 2) It is geared towards a mass audience that don`t all have Autopian standards and knowledge. I do really like super clean! I wonder if they gave him stock options lol