OK, I'm pissed off.
I really wanted reservations for the Fantasmic balcony. So I carefully marked off the pre-requisit thirty days (I want go on the 12th, so the 11=1, 10=2, 9=3 etc...) and called right at 8:00am only to find out they started selling tickets yesterday and were already sold out. SOB!
So for your future reference tickets are NOT sold 30-days in advance. They are sold one MONTH in advance, not at all the same thing. If you want to go on the 12th you need to call on the 12th of the previous month. Don't count days.