Of course you have to prepare. The video below has some great, clever and fresh interviewing tips to help you standout and increase your odds of getting the job!
One of the things you want to do is make sure you have good answers for those questions you dread the most. You also want to have some good questions ready for the employer (i.e. what's the most important thing I need to know or have to be successful at this job?). Also, be sure that you are in a good confident mood before the interview. Pretend you are your best self and be sure to be moderately enthusiastic.