You can do this man, don't over think it or try to anticipate the outcome of the interview. All you have to do is answer a few simple questions as best you can and it'll be all up-hill from here. More money, more independence, new friends - It'll be great, just try to think positively.
Make yourself look presentable before leaving and get there early. As for the interview itself, you should make known any skills / talents you might have that will be relevant to the position. Don't be afraid of sounding cocky or anything, tell the interviewer what he/she wants to hear. Take a moment to think about each question, try not to speak too quickly, make eye contact and try to smile! Good luck
Make yourself look presentable before leaving and get there early. As for the interview itself, you should make known any skills / talents you might have that will be relevant to the position. Don't be afraid of sounding cocky or anything, tell the interviewer what he/she wants to hear. Take a moment to think about each question, try not to speak too quickly, make eye contact and try to smile! Good luck