Guys, don't try to control your breathing. Understand it. When you're in the right posture (cross-legged, back straight, head down, hands in lap) you'll naturally start to breathe with your stomach instead of your chest. Don't worry about controlling your breath. Just observe it, count it, feel the air coming in and out. As Archimedes said in Sword In The Stone, "don't fight the air currents, use them."