First, Welcome to the DIS!
I would think the biggest problem is tickets being available. You might want to call WDW just to secure the tickets. If your going soon you may also want to see if they have a "Will Call" or if you can have them delivered to your resort. Either way make sure you get a confirmation number. Try calling CRO at 1-407-934-7639 or 1-407-WDW-PLAY. Have a great time!