I wouldn't really worry too much at all. For a lot of positions, the questions they ask are pretty simple (What do you think dependability means? When are you available? etc..), and if they like you, they will hire you on the spot. For some positions, if you "pass" the first interview, they will send you on to your department for either a second interview or a audition (depending on your role). Those questions go a little more in depth (prior experience, desire to work there, etc) but still shouldn't be too hard to handle
Just remember the basic rules of interviewing...dress nicely, shake the hand of the interviewer and introduce yourself, keep eye contact, and SMILE!!!!
