Successful Interview:

When you walk into the interviewing area, you should greet your interview by Mr./Mrs. and their last name.
If they tell you to call them something else, say something along the lines of "Of course, *enter name here*"
Shake their hand, tell them that you appreciate the oppurtunity to showcase your skills in an attempt to be hired, and then proceed to completely follow their orders.
Answer all of their questions clearly and concisely, and give them all the information about it that you can, without going into something that could potentially backfire in your face for saying.
Tell them what they want to know, basically, and keep it at a minimum.
Sometimes interviewers will want to know more, and that's just to find a reason not to hire you.
if they can find a reason, they usually will use that reason.
If you have any questions, wait until they ask if you do, or until the very end to get what you want to know, out into the open.
Once the intervew is over just shake their hand, thank them again and then leave politely.
Wait for at least a day to send a follow-up email, or thank you card. Or even a call.
They appreciate that you take the time to do those things, it shows that you have dedication about the job you were applying for.
Point out all the skills that qualify you for the job, without sounding cocky... Just be sure of yourself, and your abilities.
if you have a way to demonstrate them to the interviewer, than do so... it will help boost their confidence in you.
If you are hired, make sure that you thank them again, and be prompt and neat on your first day.
Other than that, interviews aren't that hard... Just be sure of yourself, and don't act nervous... make the employer want to hire you.
Thank you.
-Neiko