Wear your learning like a pocket watch and keep it hidden. Do not pull it out to count the hours, but give the time when you are asked.
Is what I live by..........I stopped in a local shop for some ammo and a young guy early 20's waited on me,,,, kidding with him I asked if a certain ammo worked (the Zombie stuff),just making conversation.. He then proceeded to tell me he was a spec op guy and killed many people with it overseas in his career......he asked me if I needed anything else and I offhandedly asked him if he had any 106mm in stock,, he walked over to the pistol ammo, looked between 9mm and .40 S&W said no but he expected some in any day.the scary part is ,he was serious...........
Not knowing all the answers isn't a sign of incompetence , a man who tells you he doesn't know but will get the answer for you is the guy you want to deal with.........Be Polite,,,be Prepared and find another part time job because you will need the extra cash while working In a gunshop...Good Luck!