Oh boy. Non-veteran tent campers, with two small children. My first thought was a hotel reservation on or off sight. If not I'd be taking those little tykes for a few trial runs for at least two nights in a row before I tried to pull this off at Disney.
Yes, yes, and once again YES!
Go do some weekend campouts, even if it's just in your back yard...getting used to sleeping outdoors is something that takes some practice (especially in Nov, when the weather isn't going to be exactly warm (though, it won't be *cold* either...you should expect lows in the mid 50s to low 60s...which, sleeping outdoors can feel...quite nippy...if you aren't used to it).
Also, if you plan to cook while there...be sure you are comfortable with your cooking utilities and know how to practice fire safety. Those little propane stoves can turn over very easily.
Be sure you check all your gear. They have a store there where you can pick up some items, and they also have items for rent (as I recall)...but, be sure to check it all before going. Also, make sure you have put the tent up several times and taken it down, and tested it for water resistance, checked all the zippers repeatedly, etc...
Tents out of the boxes, even quality ones, can have defects, and you don't want to find that out when you arrive, pull it out of the box, and the first storm blows through soaking you all.
Be sure to get a tarpolian or series of tarps (or plastic) that is slightly larger than the base of your tent.
Really, there's a lot of tips / tricks etc. to camping, and I could (as well as many others, I'm sure) go on for a while about it.
But, the first key is...know your equipment, and make sure everyone is comfortable with it beforehand.
So, take the kiddos out first!