Have a pen and paper ready when you call. This way, you can write down the exact dates and times of all your ADRs, and the confirmation numbers. They will give you a seperate number for each ressie. I put my list in a folder with the rest of my honeymoon stuff.
Some people will put their ressies and confirmation numbers in their cell phones so they can have them with them when they're in the park. I've never done it, but it sounds like a good idea. I think I'll do it for our next trip.