For my stage show, I advertise, then take applicants, then interview them. I hire based, not on experience, although that helps, but basically height, weight, looks, age and if they've ever had any acting classes, drama classes, theater experience...things like that....these are for female assistants.
For the males, entirely different process. One of the things I say in the personality interviews is "Tell me a secret that someone once told you not to tell." If they tell me the secret, I don't hire them. Seven out of ten people will spill their guts and repeat a secret someone once told them. If they can't keep a secret, I don't want them in my shows. I have had applicants tell me, "I can't tell a secret, then it wouldn't be a secret anymore." That's basically the answer I'm looking for. Yeah...It sort of tricks them into it, but they need to pay attention, and be able to think fast. And of course, I have ALL crew members sign a Nondisclosure Agreement. I'm really choosy on who I hire....It takes someone with some personality and acting skills..not just anyone off the street.