Congrats on your upcoming disney trip, I'm so excited for yall to experience the magical, albeit busy Christmas atmosphere of Disney.
The best advice is to begin researching info on wdwinfo.com as well as other websites like wdwprepschool, touringplans blog, and easywdw (they have great touring plans, cheatsheets, and maps).
Set aside a bit of time to schedule out your trip because especially in the busy seasons, an Excel spreadsheet of ADRS, meals, fastpasses, and must do character meet & greets or rides will simplify and allow you to visualize your trip.
Despite being a teenager, I'm the dis fanatic in my house so I take charge of all the booking and planning for our disney trips and now my first disney family reunion! (Luckily that's not happening during the holidays).
Don't be afraid to plan, extensively or just the basics, as you can always be spontaneous -but without some idea of a touring plan, you'll be aimless in the crowds.
I recommend easywdw because they have cheatsheets with touring plans to easily go through the parks, and easily-read maps of the parks.
Touringplans.com is also great because with a small subscription fee, they have a mobile app with actually accurate wait times (the disney app is notoriously slow and glitchy & the posted waittimes aren't accurate/updated that often). They also have plans that you can customize, even if you never us them, to organize your rides, meals, and breaks.
Finally (sorry for the info overload, I could go on for days) wdwinfo and the dis is a great info source for news updates and the aspects of the parks and resorts.
Beyond planning, here are some must dos:
-Florida winter is very iffy so it can get quite cold up to mild weather so pack lots of layers.
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-Rope drop is the best way to get a jump on the crowds, but don't try to be at the park that early if the kids are too tired.
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-Same goes for Extra magic hours: unless you can allow an hour from wake up to be at the bus stop and an hour for transit and getting through the turnstiles, the extra crowds that come along with the EMHs make waits even worse. So, just know your family and if they can be up a 6 for an 8 am open or better served sleeping more and skipping the extra busy EMH park.
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-Moleskin is perfect to put on sore blisters.
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-The second parade/show of the night is always less busy.
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-Still drink lots of that free ice water you can get at any counter service restaurant and take an afternoon break for relaxation, naps, etc to avoid total meltdown.
There's probably an encyclopedia more I could write but just remember to relax and enjoy the experience.

