I'd still call first thing when their lines open and request it before any of your other ADR's. I went by the old method (setting clock to the official time down to the second, dialed a few seconds before the lines opened, and knew the promtps ahead of time to cut back on losing a few seconds to get through). It worked for me, so it won't hurt to try. If they tell you you can't book it, don't listen, because you can! As long as you have a hotel ressie and are within your 180 window, you can book it.