My first trip realizations were…
Everything has a wait including FP lines, mobile order lines, photopass, all the things even the “quick” things.
Don’t underestimate how tired you will be. We planned for rest breaks but the exhaustion was overwhelming for all of us. It’s like a marathon so pace yourself.
Don’t be afraid to venture outside the parks! Getting to other resorts from the parks is so easy and provides a nice break.
Last, just use the snack credits.