I have been trying to learn to knap too. I am still not anywhere close to being good, but am getting more consistent. Definitely have more of an appreciation for the skills of the people who do it right and make it look easy. Maybe in another few years I'll be able to pass for competent.
Have learned a few things so far though. a good leather piece or several layers of canvas as padding/protection on my legs helps. Also, made some tools out of copper pipe and end caps and put a bit of lead in them. And make sure you have band aids, yeah, pleanty of band aids. :thumbsup: