How to Succeed at a Job Interview

There are many people that when they are looking for a new job will manage to get interviews, but when it comes to actually landing the job failure is constant. Just one or two interview are not such a big deal, it could simply be that they are no longer a match. But at the same time, those two interviews could be the beginning of a trend, a trend of continued unemployment or underemployment.

Before the interview:
Be sure you are groomed as perfectly as possible. Dress for success, regardless of the position. The job is not important to the fact that a prospective employer will look at you and know that they will never see you looking any better than you do when you arrive at your interview. Wearing a tank top and cut off jeans is not the way to impress your employer.
Arrive well before the time of your interview. Once you know how long transportation will take and add alot to that time estimate. Arriving late makes you seem like you have no concern for time, this is something all managers consider.
Get a portfolio or other nice folder to carry extra copies of your resume as well as a notebook for making notes.

At the interview:
Assuming you have listened to the points above, you have arrived and are now ready for the interview proper. Be open with your statements and with the interviewer. Be sure you smile, no matter how bad your day was. They do not really want to know how you are, it is just a common form of greeting. As this is a general guide, we will stay general. Do not lie or embellish the truth. Overstating the truth a little, that may be okay depending on the subject, but lying is not advisable. 

If you claim you have a skill, be prepared to answer questions about that skill. If it is not really that well known, such as a skill that you have not used alot in recent times, then re-familiarize yourself with the skill. If that is not possible it would be more advisable to drop it from the resume then appear to be a liar. Liars do not get hired. Don't be afraid to say 'I do not know' your honesty will become a refreshing highlight for your interviewer