Welcome aboard, Brittany!
Great to hear that you are an experienced cruiser and you're now going to check out the Disney Cruise Line ships. You will likely be able to notice differences... but the main difference it sounds like is that your mother won't be sailing with you on this particular voyage. I'm sure you'll be just fine and you'll be able to manage through everything.
I hope that you have all your cruise documents with you now. You'll primarily need your Reservation number to access the
My OnLine Check-in system -- that would be your 1st step just to make sure you've got all your travel documents noted and attached to your cruise reservation. You'll also be able to make reservations for port adventure and onboard activities at 75 days prior to your sail date - since you are a 1st time guest onboard the Disney Cruise Line. Have you already made arrangements to get yourself to the Port for embarkation day? Once you are at the Port Check In Counter, your check-in should be pretty seamless if you complete your OnLine Check-In before hand. You will need your passports and your printed signature form to present to the cast member checking you in. They'll give you your Key To The World Key Cards, which serves as your room key and onboard charge card. You'll also be given your dinner rotation once you check-in, along with a Personal Navigator, which notes all the activities that are going on for the day.
You'll need to make sure that you've got your luggage tags on your check-in luggage to make sure that your bags are delivered to your stateroom that afternoon. If you have any items that you'll need for the day (prescriptions, bathing suits, sunblock, etc), you'll want to keep these in a day bag to carry onboard with you on embarkation day.
I hope this info helps. Let us know if you have additional questions. ~ Dolly