LadyLuc - I think you'll be ok. We were there the week before your dates this December and while it was a little more crowded that I was expecting, the crowds were still very manageable and only the "biggie" rides even had Fast Pass turned on. That included RNR and Test Track, but even then not all the time. One day we walked right on to Tower of Terror and the wait for Dumbo late morning was only 10 minutes. The weekend will probably be more crowded also, but during the week you should have no problems.