Some things to know -
Just about any change you make after booking requires payment of a new $75 fee, so try to have everything set before you reserve.
Not all of the cabin categories are available for points.
Cash customers are able to book more than 11 months in advance, so sometimes the best cabins get snapped up befoer
DVC members have a chance to book them. Not sure this is still true though as I think DVC members can now book up to two years in advance.
If you cancel, the points cannot be reused for a stay at a DVC resort or for an exchange via II or the Lake Buena Vista Trading Company. They can only be used for another cruise or for something else in the Disney Collection, the Adventurer's Collection or the Concerige Collection.
If you pay cash for one or more members of your party, you have to pay the entire amount up front. The cash price you pay is the one DVC negotiated with
DCL - it might be more or less than the price DCL or a TA is charging at the time you book. At least one person per cabin must pay with points to book through MS.