1. Don't shake hands on initial meet, shake their hands after unless they put their hand out to shake yours and if so, be a man and give him a firm handshake. Weak handshakes say a lot about a man, so do you want to come off as a wuss?
2. Be calm and relaxed
3. Answer questions with confidence.
4. Eye contact
5. Be truthful.
6. Be 5-10 mins early
7. Dress appropriate for the position. If it was to be working in a warehouse then its ok to be a bit more casual; say jeans and a nice dress shirt. If you would be working in a office then khakis /dress pants with a nice shirt, shoes and tie.