Make a Good First Impression
You only have one chance to make a first impression. Plan to arrive with plenty of time to compose yourself before the interview begins, but don’t arrive at the office until about 15 minutes before the interview is scheduled. If you find you will be delayed, call them to let them know. Be courteous to everyone you come in contact with, as support staff are often part of the screening. TURN OFF YOUR PHONE and spend your waiting time reviewing company literature or your notes or questions.
Greeting Your Interviewer(s)
Some researchers say that up to two-thirds of our communication is non-verbal, and your interviewer forms an impression of you not just from what you say, but also from how you look and how you conduct yourself. Greet them with a smile and a firm handshake to get things off to a good start. Try to communicate confidence.
During your interview, maintain fairly consistent eye contact and good posture. It's OK to be nervous — even experienced job-hunters will be — but watch out for nervous 'tics' (the nervous giggle, playing with your hair, knee bouncing, etc.).
Don’t just practice your answers in your head as your interviewer is talking. Listen attentively. Don't be afraid to ask for clarification when you don't understand a question. Have a number of questions to ask your interview that show genuine interest in the company culture and what expectations would be for your contributions. Remember that you are evaluating the organization, just as you are being evaluated.
A Strong Close
Closing: make sure you know what the next step is, and what action (if any) you are expected to take. Summarize/re-state your qualifications for the job and your enthusiasm, if given an opportunity.