To make a good first impression when meeting customers, properly dress, arrive on time, smile, introduce yourself, have a firm handshake, speak clearly, maintain eye contact, listen more than you talk, ask questions, shift the focus to praising the customer, give without expecting anything in return, avoid distractions, don't be self-important, and keep the conversation positive. Research shows people make judgments about others within the first seven seconds of meeting based on factors like appearance and that first impressions are difficult to change.