I apprenticed at an automotive body shop as a teen, late 1960s, early 1970s. Learned the trade from a guy who made body and paint his life’s work. I’ve painted a lot of cars, pickups, big trucks, a couple of tractors, and dozens of refrigerators.
I even painted my mailbox.
Good tools go a long way toward an acceptable result. I still own all the tools from then, and have added HVLP spray guns back when the paint systems changed.
Devilbiss is among the best, and all I own, both suction and HVLP.
The difference is in how the gun handles the material. A good spray gun will produce an even spray pattern, a cheap one will not.
Always clean the gun thoroughly after every use, especially with today’s catalyzed paints. Once they cure out, it is impossible to remove them from the passages inside the gun. Take good care of your equipment and it will reward you with good results for many years.