I don't think it's ever too early to start planning your next Disney vacation, but it is really impossible to nail down details until at least a year out. I started "planning" for my April 2013 trip pretty much when I got home from my May 2011 trip, but I am just now calling an agent to book. It seems like most of the "deals" really start showing up a few months out. That being said, I don't think it would hurt to find an agent and call with a few questions. This will help you know what to expect when you do call to book your trip. You can learn a lot from your
Disney travel agent. I also recommend using a DISNEY agent, as they are specialists in
DISNEY vacations.
But my advice is, just keep doing research. The agents are a HUGE help, but the more you know, the more prepared you will be for your trip.
My suggestions of things to make sure you read up on before now and then:
1) Packing lists - A great way to make sure you don't forget something. A lot of people have some great suggestions!
2) Modes of Transportation - Disney's (free) Magical express from airport (RSVP through agent) and on-property transportation (boats, monorail, busses, etc.)
3) Dining at Disney - Dining plans, individual restaurants, and special dining experiences (character dining and dinner shows). Agents are a HUGE help with learning about dining at Disney and they can help you book your reservations.
4) Touringplans - Some sites have "Touring Plans" that give you some great ideas about how to tour the parks to reduce wait times and/or walking. They are specialized for different kinds of travel groups (groups with kids, groups with teens, one day, two day, etc). I like touringplans.com. They also predict crowd levels for each day in each park and tell you which parks to avoid on certain days. It also gets updated so make sure to check back every now and then. They also give you current line wait times, to give you an idea of what you can expect. It's a subscription service, but you might find it worth the investment. I do! (There are other sites that predict the best weeks to visit. This may help you choose a week in December.)
5) Hours and showtimes - Park hours and show times are not released until around 6 months out, so it's difficult to "plan" your days, but you can get a general idea of how long the parks will stay open and what time of day the shows and parades are. This also helps you know how many days you need per park. (I like touringplans.com for this as well. They post set hours, as well as predicted hours for unset days.)
6) Closures - As your trip gets closer, check for attraction closures. This may help you choose a date for your trip, or at least prepare you so you aren't disappointed when you get there to find an attraction closed.
7) Podcasts - If you want to get REALLY into learning about Disney, find an online podcast to listen to. You can learn a lot about the history of the parks, overlooked details and suggestions for your visit. My personal favorite is wdwradio, which you can stream online or download from itunes for free.
8) Special experiences - Disney offers a variety of "special experiences." Backstage tours, fireworks cruises, wildlife encounters, park tours, even haircuts! You may want to add one to your trip. You can book these through your agent.
9) Seasonal Special Events - Since you're planning your trip in December, the holiday season will be in full swing. Look for special Holiday events that might be going on during your stay. Some of these are "extra" and will need to be booked with your Disney
travel agent.
10) Weather - Get an idea of what the weather will be like so you know what to expect and what to pack.
I hope these tips will help get you started. Keep surfing the boards and good luck choosing an agent and planning your trip!!