Yes, that's all you need to do. You can look at the deck plans on the Disney site to see where the cabin is located, if you haven't already. The "secret" hallway to the cabins is behind next to the bathroom. It doesn't really show it on the deck plans. I should have mentioned before that cabin 2556 only sleeps 3, it doesn't have the upper berth. If you need a cabin for four, you could ask which ones in that area sleep four. If I remember right, cabin 2554 might sleep 4. I think the people on that side of us had magnets will four people's names.