Well, to go from where you are now gainfully employed, you have to do some homework. First, you should understand what I consider as the main marketing center for interviews, your interviewer will see yourself in the market - that is, you are the product and your interview is your campaign. After all, if you cannot sell, why trust anyone to market your products? This means you need to stand in the light such that your interviewer wants to "buy" you. You need to identify a company or department need and explain how they can meet that need. The interviewer in some of his / her questions often expresses these ''needs''. For example, "How to deal with an environment of rapidly?" equal "you tell me how to prioritize and do not break under pressure." Read between the lines and hear what the interviewer is really asking.
Next you need to know as much as possible about your interviewer without being unpleasant for the person setting the interview with you (whether or not the person who will meet the day). Try to find the interviewer level of seniority in the company and its place in the structure of society in general. Especially if this person would be your direct supervisor, this will help you determine if the role you are applying for fits in the same line, you need to know something about the company you are applying. For example, if you are applying for a small business that sells intangible assets and not investing in brands, he was barking up the wrong tree if you try to tell them all about the group project that was on the revitalization of a brand fast food chain. Instead, on the basis of its investigation into the company, the interviewer and the details of a job, you should match your skills they need. A good way is to write down some notes before your interview to organize ideas (better not to take with you though, as you can make it look over-rehearsed), as follows:
1) Company X wants: copy writing
Offer: my experience in designing, drafting and editing the events page of my college drama club
2) Company X wants: leadership skills
Offer: demonstrated leadership skills in summer job that needs trained employees of other summer
As for the day, make sure you are prepared. Dress better than you think you need. Do not worry if you are too warm outside your interviewer - who already have jobs, so your need to wear is significantly reduced. Furthermore, bringing examples of relevant papers and your references, even if not complete your calls. It is better to make the offer, which has to be sent later. Above all, present yourself with confidence, enthusiasm and professionalism.