When you go to an interview, be sure that you remember what you wrote in your application and the details of the job listing.  It's also a good idea to do a bit of research on the company you are applying at. What is their basic business model and what makes the company unique? Are there any guiding missions of the company? These types of questions can usually be answered by some quick internet research, but this kind of information can really illustrate your interest and dedication if brought up during an interview. Brainstorm and write out any aspects of your personality or experiences in your life that may be pertinent to bring up during the job interview. These are things that you probably did not list in your resume but are important to get across to your possible employer. For example, this could include your personal qualities and work ethic. An interview usually has two types of questions, technical questions and HR questions. Technical questions gauge whether you know how to do the job you are applying for, and HR questions are designed to see if you are a team player. You will need to be able to answer both types of questions with confidence.  Some examples of HR questions are: Where do you see yourself in 10 years? How do you handle criticism?  How well do you work on a team? When asked, "How much money do you want to make?" you can provide your current salary. Or, you can say, "I am open" or ask, "What is the range of pay for this job?" When asked, "What don't you like about your current job?" if you answer anything negative, even though it might be true, it will make you look like a negative employee. When asked, "Where do you see yourself in 5 years?" if you don't answer with a position slightly above your job title, it will look like you don't really have interest in the job. You could even practice your interview skills by organizing a mock interview. If you're interviewing but not getting offers, then you have not yet warmed up to the interview process.  It takes 3 to 5 interviews to get warmed up and get offers. While the appropriate attire will vary, depending on the job you are applying for and the company you are applying at, your appearance should always be neat and clean when interviewing for any job. Make sure that in addition to being dressed nicely, with professional clothes that are neat and clean, that you have also done some personal grooming before your interview. Small issues, such as body odor or messy hair, while not necessarily a deal breaker, can be a huge distraction for the people interviewing you. The goal is for your personality and experience to shine, so don't sidetrack those interviewing you with other things.

Summary:
Review all your application materials and any job listing information. Practice possible interview questions. Have a professional appearance when going to your interview.