We already know how to draft, to sit on wheels. We learn as we move up and down in the line, as the line rotates. In a rotating line, we learn how to come through, to move to the front, stay there a while, and get off again. We learn to do those things so we don't disturb the progress of the group. With practice, it's seamless and becomes second nature.
Different groups rotate in slightly different ways.
No matter what way your group does it, sitting behind unchanging leaders won't teach you any way at all. And following eternal-leaders won't get you to the front. If the lead rotates, eventually you will come to the front. While you're there, the group's pace is up to you. You learn to accelerate gently out of corners so as not to string out the group behind you.