Also know your audience and what their concerns are. If it is a customer worried if about you managing to cost and schedule, then wear a suit, use a professional vocal register, and takenthe steps you suggest. If they are worried about your competency, dress and act a bit eccentric, or given you are reading this, here, stop hiding your eccentricity and wear something you normally would. The lighting and sound in that case should only be good enough not to stand out in either direction.