I used to be part of the angst filled group, waiting for CP pkgs to come out and be able to book. But, then, I realized that it was not that big a deal. Okay..if you want LeCellier, then yes, it is going to be harder to get. Or if you have one night to do it, and only want one or two different restaurants, then maybe it's going to be harder.
But, last year, I was able to book what I wanted, several days after the booking window opened, and then was able to change it to something else a month or so later. Was the change exactly what I wanted? No, not 100%, but it was a very good alternative, one that I was quite happy with.
As long as you are somewhat flexible, you should be fine..even if you miss that first day or two for booking.