Are you staying on property? If so, pick up your tickets as soon as you check in at the concierge, or at least the same day. The earlier you pick up your tickets, the better your seating will be within your chosen cateory. (I learned that the hard way when I picked up my tickets on the day of the show and we were the very back table in category 2!)
They recommend arriving at the HDDR (with tickets in hand) I think at least 45 minutes early..they do take photos out front.
Have fun!