Hi Pat! Welcome to the Disney Parks Moms Panel!
  In just THREE days you'll be enjoying your Walt Disney World Resort vacation! I know how exciting it is to be SO close to your magical trip.  
Disney Early Morning Magic - Fantasyland is a fun event that allows entrance into 
Magic Kingdom Park beginning at 7:45 a.m. Since it sounds like you will not have tickets to this event, you will be able to enter when it opens for general admission at 9:00 a.m. In my experience, entrance begins a little earlier than the posted opening time, so I like to arrive 30-45 minutes early. I spoke with a Cast Member that said on Disney Early Morning Magic - Fantasyland days, entrance doesn't begin until 9:00 a.m. 
 Here is what I would do: arrive 30-45 minutes early and get in line for general admission. If they do allow you in early, you are ready! But if they don't, you are at least ahead of most of the line and will be able to head to 
Guest Relations and 
Stroller Rental right away. Then away you go, to enjoy all of the 
Incredible Summer activities taking place right now! 
 I hope you have a wonderful vacation, Pat! Please visit us again with any other questions you may have. 
 Tabitha