Cinderella's Royal Table is in the castle, and you eat with Cinderella and friends. It is the single hardest thing to get at Disney. You MUST call 60 days out at opening. I'd suggest you read the CRT thread. Here's my story:
It took me 5 days of calling at opening to get space, and if people hadn't also been calling for LTT for Thanksgiving that day who knows if I'd have gotten it. I used www.atomictime.net and got through at 6:58 EST (5:58 my time), got my PS for CRT then LTT and was hanging up at 7:03:30. If you get a CM at 7:02 EST, you'll most likely hear there's no space. Cancellations do happen, but imho there's less chance of picking one of those up than by getting a PS 60 days out. Good luck!