Okay, I've seen 2 schools of thought on breathing. I've always held my breath after the inhale. I've also read that you shouldn't hold your breath at all but time your breathing so that your trigger pull will be at the slack time in your breathing pattern. I guess now there is a 3rd option of holding your breath after 50% of your exhale. I've always found holding my breath after inhaling works well for me personally. I think quality equipment is a big issue personally. After that I would say the most important thing is practice.