I would worry about breathing methods AFTER you have been on a disciplined, organized training program for a few months. Riding by myself I rarely push hard enough and a group ride is either too fast or too slow or too easy (drafting). In group rides I've heard in the first most just try to stay with a group that is too fast for you, the second month stay in the middle, next stay in the front. When you can stay at the front, find a faster group.