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Whether you're meeting someone for business or pleasure, there's no quicker way to ruin someone's impression of you than to be late. Instead, you should try to get wherever you need to be a few minutes early. Not only will this prove to the other person that you're a go-getter, you'll also alleviate stress on yourself. This will ensure you're as clear-headed as can be for the interactions ahead. Using positive, confident body language can demonstrate to everyone around you that you have confidence in yourself and your abilities without ever needing to open your mouth. Demonstrating assertive body language has a bonus effect of actually making you feel more confident as a result, even if you're only faking it at first. Try practicing in the mirror if it doesn't already come naturally to you. It may be tricky at first, but it does come with time. Eye contact is a powerful technique in body language, and for good reason. Making eye contact shows confidence. A firm handshake is crucial, particularly in business settings. As always, solid posture will show everyone that you respect yourself. Considering you're the one who's wanting to make the big impression, it may seem counter-intuitive to quiet down and let the other person take the reins for a while. All the same, people tend to be more impressed by someone who demonstrates a sincere, vivid interest in themselves and what they do. Demonstrate effective listening skills: reiterate what the other person is saying to you, ask questions, and don't interrupt until there's a natural break in the conversation. The art of oration isn't one that can be learned overnight. All the same, knowing how to speak well and confidently can sometimes leave an impression all on its own. No matter whether you're on a date or at a board meeting, speak in such a way where none of your words are rushed. Speak with slightly greater volume than you'd normally be comfortable with. Breaking out of your comfort zone in ways like this will set you apart from the crowd no matter where you are. Don't forget to use the person's name whenever it feels natural. People love hearing someone say their name, and the same can be advised if you're trying to make them remember you.
Be punctual. Use assertive body language. Be a good listener. Speak well.