I am Sooooo Confused over Paint

X 2 on SPI
I had my car done by a local guy on the side. He really liked the SPI stuff EXCEPT he’s a sprayer in a high volume shop and isn’t used to the wait times some of their stuff requires.
Used the SPI Epoxy, some filler, sealed work with more epoxy & painted my car with shop line ( I think) from the local NAPA paint supply, & cleared it with a few coats of the SPI
After now seeing the whole process, if I was to do it again, I would probably tackle it, I just didn’t want to have what turned into an expensive 8 year project loosed up by trying to paint myself with 0 experience