Hi Chance,
Try not to stress about it! There are so many great options for character dining and I know it can be tough to choose which one.
What we do is put our list together of what character dining experiences you want to have and then we put together a back up list, in case we can't get a reservation.
You can call in and speak with a Cast Member to help you organize and book your dining reservations 407 WDW DINE
For princess dining here are a few options:
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Akershus, Epcot Norway Pavilion
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Cinderella's Happily Ever After Dinner at the Grand Floridian resort
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Cinderella's Royal Table, at the Magic Kingdom in CInderella's Castle
April is fast approaching, I would call in and see what is available for the days you will be visiting and go from there.
Don't forget that there is also Character meet and greets in the parks, where you can meet and have your picture taken with your favourite characters. Check the Times Guide when you arrive to see where and when you can see your favourite characters.
I hope this helps, if you have any other questions, please let us know.
Wishing you a wonderful vacation with your little princess,
Carrie