Stipulate the goals of your career and the reasons you prefer the position.
Consider your responses.
Put on a nice suit. Be smart and neat.
Read about the industry, manager, and job opportunity.
Say thank you to your interviewer at the end and after by email or send a 'thank you' letter by post.
Try not to oversell who you are.
Be genuine, optimistic, engaged, positive, forthright and to the point.
Advice for Job-hunters:
"Say it clearly. When you are sending out CVs, catch the future employer’s attention with a brief and concise cover letter that spells out distinctly how your credentials match the occupation needs.Connect the dots for the reader, making it obvious why you are the best candidate for the position."