NWA - Early in November you probably won't need them, unless you are only taking one day to go to Uni and want to do EVERYTHING. The EP's aren't good for the big Harry Potter rides (Forbidden Journey & Gringotts) so get there right at park opening and do one or the other with a shorter wait.
rockinmama - Around Thanksgiving it will get more crowded, so they would be a lot more helpful. I would imagine you could upgrade at Guest Services, which at both parks is to the left at you are facing the entrance.