The Great Red Eye of Disturbance!
If your actors absolutely cannot act whatsoever, or freak out once the camera’s on, make a big noise about your DP turning the camera off while you run through some off-camera rehearsals. Have the DP filming this secretly (“Just pulling focus, guys — don’t mind me!”). No matter how crappy an actor might be, they can usually be themselves with some reasonably convincing skill.
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