My Dad was absolutely ruthless when pruning! He carried loppers on the lawn mower with him, and nipped constantly all summer long. He thinned so much you would think there never would be anything to pick. Of course, he had the biggest most beautiful fruit you've ever seen as the result. "Do you want to grow pits or peaches?" he would say. Meaning, more in number just means more energy goes to seed production with less fruit surrounding each pit. On pruning, "You can cut the limbs off yourself, or Mother Nature will break them off for you later on." Still, it is hard for me to cut on my little babies! Good luck.