iPod under warranty can I just take it to a store and replace it, as the support rep told me I can via a case number?

My iPod Touch of four months no longer works the kind support rep told me that they will replace it. All I need to do is go to the apple store nearest to me with the case number and they will replace it?

My wife then told me I need to make an appointment! before I travel 38 miles to my nearest store do I just quote the case number the support rep gave me. Or god forbid my wife is right 🙂 and I have to book a reservation.

Also do I need anything other than the case number?