No, you use the breathing to take the focus off the urge to push. If you are focusing on breathing, then you can't push, kwim? When you push, you don't breathe at all because all your energy is directed at working with the contractions by giving a big push. By breathing them out, its not like you are using the act itself to help expell the baby, rather that you are just letting them do all the work instead of you doing all the pushing to get them out.

You will notice a huge difference in the second stage with this bub anyway. You need a lot less direction on how to do it and because it is usually a lot quicker than pushing the first baby out, then often you don't even have time to think about what you are doing most of the time.