I would go ahead and book. Today was my 180 day for ADRs for our December trip, so I called and booked during my lunch break. I couldn't believe that some of the restaurants were already pretty picked over for times available. My daughter really wanted Chef Mickey's for breakfast, the day I asked for only had like two available times left (7:50 am or 10:40 am). I couldn't believe at more than 180 days out there was that little of a choice left for Chef Mickeys. I know other restaurants are hard to get into, like Cinderella's Royal Table, but Chef Mickey's I didn't think I would have any problems. So if I were you, I would call and book them just in case you can go. Then if it turns out you have to cancel call as soon as you find out you won't be going so other people can have those spots. Good luck, hope everything works out for you.