That's the best thing about lacquer- if you get run, or dirt, or cat hairs, etc. in the finish, you just sand them out. If you cut through the top coats, no big deal. Just give her a couple more coats- block amd buff.
Honest- it won't take much to get the hang of the guns. I don't drag 'em out for small stuff because of the set-up and clean-up time. Then you have to have the materials on hand. If I painted at least one guitar a day, I'd use spray equipment. You can really lay on the paint in quick order.
If you have a touch-up gun it's perfect for painting guitars. And because of the adjustability, it's great for bursts. Then you have the unlimited colors to choose from. One thing about guns though- they need to be clean and "in tune." You need to filter the paint going into the cup. And you need good, clean, dry air.