Good tips, Bernadette. I would also really mentally prepare. Ask yourself the questions that they will most likely ask you and have an answer prepared. Perhaps even write up a little cheat sheet that you can reference througout the interview. Just don't become to dependent on the sheet.
The most important pieces of advice I can give are be prepared for anything (don't get stuck in the idea that they will only ask certain questions) and know when to stop talking. A common method of interviewers is to let interviewees keep talking (aka nervous rambling). That's when interviewees tend to trip themselves up.
Also, you may not know the answer to every question, but they are looking for your ability to think on your feet and solve problems. I.e. the interview question that asks you how many pennies would you have to stack to equal the height of the Empire State building. Not many of us know that off of the top of our heads. But if you answer them with, "That is a good question. I don't know the answer, but this is how I would come up with the answer. Are the pennies stacked on their side, or are they flat? Once I determine that, I would find out the height of the Empire State building and the height of a penny and make the calculation." Granted, MAC probably won't get that detailed with your intervew (they didn't with mine), but you get what I'm saying.
Take a deep breath, relax and know that you can do this!
Good luck and let us know how it goes.