I recently did this for a client, and they wanted to make them as the 60 days came up, not the whole week. You might want to wait until the last 60-day in advance & make them all at that time. As Mom2micayla said, they do not go as fast as the WDW ones do. I was able to make Ariel's Grotto lunch during 4th of July weekend just a few days before. You should be okay waiting a couple of days if you are still 2 months out.
The one that is in high demand is reservations for Fantasmic Dessert Buffet.