Quarantine protocol--30 days DISEASE FREE. Bare or nearly bare tank.
Acclimation techniques are derived from methods while working import/export, so they are for what were usually extremely stressed animals. Very similar to what Lawdawg outlined, with pre-testing of bag water to determine most important parameter in my experience, pH. Depending on disparity between bag and system parameters, I'll do a drip acclimation of anywhere from 1-4 hours. If there is no difference, then as long as system temperature is warmer, then they get drained and dropped in.
NEVER add bag water to your QT or display! By net or hand.