I took Bradley waaay back with #2. Boy that seems forever ago. This short little essay from Michel Odent has made the most difference in my births of anything I have read, and I have studied birth and midwifery for over 10 years: http://www.wombecology.com/fetusejection.html Basically, don't even think about pushing until you can't not push. Your body will push that baby out without you having to voluntarily do anything.
My second, at home and after taking Bradley, I pushed for 4 hours, and my third, for 7 hours (ended up a hospital transport, but vaginal birth), both because I was "complete" and should just push. My fourth was three pushes, fifth was two, and the sixth was a totally unexpected one push, as the midwife barely pulled my underwear down, placed a chux, grabbed her gloves and broke my water, all at once.
Oh, my other tip, use B-H contractions to practice relaxing. Train your body that a contractions means letting go of all your muscles and breathe deeply.