Assuming there's no tolerance at play...
I think 2mg of alprazolam/clonazepam would be okay to keep you relaxed but lucid. I'm sure any benzodiazepine aside from the hypnotics would be just fine in an equivalent dose. Avoid alcohol at all costs. If it's a panel of people, you can be sure one of them will smell booze.
lol no shit 2mg of xanax or klonopin without tolerance the op can easily fall asleep while getting ready lol which defeats the purposeThats wwaaaaaaaaaaay too much. No chance of getting the job if you pass out halfway thru. 0.5 of either is realistic
Go in clean and try to be yourself.