Everything that was said here is good. I have a few to add:

Be confident, but not cocky

Present yourself with good bodily posture

At the end, they always ask you if you have any questions. You aren't allowed to say no, it shows you can't think on your own. Make up a bunch of questions about the position or the company to ask and ask one or two. Making sure it hasn't already been answered. If you applying for a job that you have some experience with, ask a question on something procedural.

When they ask you what your "worst attiributes" are. You need to answer with something positive. Like, "I care too much."

Good luck! What is the job you are interviewing for?