How do I get the most out of my actors?

I'll be shooting a black and white 16mm short soon and would like to get some tips off anyone out there as regards working with the talent.
Should I be as quiet in my instructions as possible (non-obtrusive)?
If a scene is not going right should I cut midway through?

I'd be happy to know of any little tips to loosen them up.. ice breakers, words of advice etc.
 
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