We are leaving in a month too! it is our first trip. I have laid out our suitcases in the spare bedroom and started tossing in items that I know we won't use until we go- ie... swimsuits and stuff we bought to take on trip. I have also got my travel documents in a little folder ready to go.
Other than that, I wake up everyday and tell my family... Do you realize we are going to DISNEY???? They look at me like I am on crack but I have been the only planner in the family so I feel like I am the only one who "gets" how magical this is really going to be for us!!! Since we are going to be gone 8 days and I flat out REFUSE to do laundry on this vacation I have been shopping some nice re-sale shops for enough casual clothes for us to last all 8 days- since I work during the week I just have a couple "weekend" clothes. I have got some super cute shorts and capri's for next to nothing!