Yes. You will be just fine. Just don't forget the credit card you paid with. You definitely need it. We did it on our trip and it was so painless. Just walked up to the machine. Entered our confirmation number, swiped our cc (it won't charge you again, only for security reasons you swipe it) and out came our tickets.
I used this method in July and it worked like a charm. As SpideyHulk said, be sure to bring the credit card you used to purchase the tickets and the confirmation number. You will have your tickets in a jiffy!!!!