You can shoot that primer. It's all just practice. My dad handed me the spray gun when I was about 12. You just learn by doing. It helps to have someone like your buddy who can guide you as you go so you don't have to learn everything the hard way.
My buddy said I should jump right in, I can't screw it up and we can always sand it off. 😀 I'll be giving it a try the weekend after next, the wife and I are taking some vacation time next week/weekend away from home and the garage. 😉