It doesn't get much easier than this. Make sure the hair is wet and then pull it all back into a ponytail. Once it's all in the elastic, wrap the hair around itself as if you're making a knot. (Just like you would tie a knot in the bottom of your thread before you begin sewing.) Bobby pin the ends of the hair to the head and you're finished. If your princess's hair is not long enough for a full ponytail knot, try using only half the hair.