As a former professional in the staffing industry, I've conducted a lot of interviews. These tips for a job interview will give you a better chance to walk into your next interview with confidence, and perform at your best.

Tips for a Job Interview #1: Do Your Homework

There is absolutely no doubt in my mind that a hiring manager can almost instantly tell the difference between someone who really understands the job they are applying for and someone who is "carpetbombing" the internet with their resume and just hoping something sticks. Before your interview, you need to read everything you can find about your company on the internet. (Much easier if they are publicly traded or very large, but not impossible if they're not.) Know their products or services, and if possible try to find their latest press releases and a transcript of their latest earnings conference call. (This will usually be in the investor relations section of their website.)

Tips for a Job Interview #2: Dress for Success

Even if you're applying for a mailroom position with a super-relaxed software company, you're better off being overdressed for the interview than underdressed. Unless the company has specifically given you different instructions ahead of time, show up in a conservative suit (blue or black is best) and SHINED SHOES. Even if no one looks at your shoes once, covering all of the little details and looking your best will make a subconscious impression on the interviewer and let him/her know you are serious about the job. (It may also give you a little subconscious confidence boost yourself.) Don't over do it on the perfume or cologne, either. A good rule of thumb (in life, not just interviews) is that only your lover should be able to smell it.

Tips for a Job Interview #3: Find the Pain Points

This job is open for a reason, whether it's because the former employee in that role didn't perform well or because business is growing so fast that they urgently need more help. Remember, employees cost money and a well-run business doesn't increase their costs without a good justification. Chances are the manager of this position has a number of items causing him stress, and he's looking for the right person to ease his pain. Make sure you ask good questions and find those pain points so you can sell yourself more effectively as the right solution.

Tips for a Job Interview #4: Everyone You Meet is a Decision Maker

I'll tell you a little secret from my career in sales. When you walk into a client's office, the first person you talk to is usually the receptionist. Treat them with respect. The receptionist, especially at a large company, knows EVERYONE in the company. They see them arrive in the morning, and they see them leave at night. Chances are good that they will happily give their opinion of your friendliness and personality some time shortly after you leave the interview. You never know who will have an impact on your chances, so treat everyone you meet at the company with respect.

Tips for a Job Interview #5: Perfect Practice Makes Perfect

I saved this one for last, but it is really one of the most important tips for consistently performing well at a job interview. You have spent a lot of time in your life either studying for a degree, or increasing your skill level in your career. Unless you are in sales, it's unlikely that face-to-face interviews and meetings have been a large component of your background. You remember the first time you gave a speech in class? You probably made some mistakes and didn't come off sounding very polished. But after practice, you probably got better right? An interview is similar, and you need to rehearse and practice every piece of it until you can perform with confidence.