It's a good idea to have a solid tantrum before you try a whirlybird, meaning one in which you land wake-to-wake every time. The whirlybird requires two things that are different from a tantrum, though. First, as you come off the top of the wake, throw your back shoulder a little harder toward the shore to which you are headed. Second, throw your head hard across your back shoulder; this will help you complete the 360 rotation in the air and spot the landing. Spot it just like a tantrum and come down with your knees soft.