Years ago when I worked at the University of Iowa's museum of natural history we had a flintknapper come in and do a demonstration. He spent a long time making a complex Clovis spear point. He was knocking long blades off a round piece of chert then finishing them. He wrecked a couple and finally finished one. Then, to show us flintknapping wasn't as hard as he had just made it look, he knocked out a perfect, tiny "bird point" in about five minutes.