The only character meals you would have to worry about is CRT and PSB - if you want either of these, you would have to call exactly at the 90 day mark a little before 7 a.m. There is a seperate thread dedicated to how to get a reservation for CRT if you want one, so you can read that if you are planning to try for that. As for any other character meal, you don't have to call at 7 a.m. 90 days out. You can call the 1-800-828-0228 number to make any PS's, but if you want CRT or PSB, I suggest you use the 407-wdw-dine number. I have gone to many character meals, some without even calling for a ps (although I wouldn't suggest that.) Chef Mickey's is popular, you could call 90 days out to get a PS for a specific time that you want, either breakfast or dinner. Have fun!