Seriously. Don't worry. In the experience of the Wish Trippers with whom I have discussed this, everything is handled for you in regards to the GAC by GKTW, so you just have to go with the flow on that. The were only a few exceptions I had to having it all very clear in my mind after orientation. I had trouble knowing to follow the Disabled traffic lane paint at Disney, which a parking attendant tried to tell me (I was a tad confused). At each park CMs will direct you to where you are to park after they see the GKTW button.
At Universal, I was not ready to present the special parking pass to the attendant as I drove in. It looked very much like one of the tickets. I am sure she thought I was an idiot as I dug for it.
Some (very few) TMs at Universal were a bit confused on how to deal with the pass. When in doubt ask what to do at attraction entrances.
There are some things we, as parents, should be planning to handle. Here is a partial list:
Packing all weather gear appropriate for the climate. For us, in September, this was
crocs, shorts, ponchos, sunscreen, a misting bottle (which you can buy easier down there than at home most times) and a hat for me.
Reservations for character meals. This is hard, because many of these are booked up before you get your trip dates. Still, calling back frequently to check on cancellations can work wonders. You can see on our TR that Disney Pixie Dust got us in without reservations (thanks Jeff!).
Believing GKTW when they say to pack light. You can wash clothes at the villa while you are soaking in the hot tub. We had to buy a huge bag because our luggage was full of goodies we received or bought. That was before the days of paying per bag on the plane.
Have cash handy to buy food on the plane.
Scheduling where you want to go each day and remaining flexible when plans need to be changed.
I will add more when I can think of things.
Bill