You can probably find a room, if you're flexible as to dates/resorts, but ADR's may be hard to find. I've heard Le Cellier is completely booked for dinner for all of September, and that's just the tip of the iceberg. If you don't mind lunches instead of dinners, or dining at some of the less busy restaurants, go for it!
If specific restaurants are important to you, what I'd do is check resort availability at disney.com, then call for ADR's before booking the trip. If you're happy with what you get, then book.
Good luck!