I just pulled this thread up to re-read it, now that I'm trying to learn how to flintknap. Lots of great tips here, and now that I've been breaking rock for a while, they actually make sense.
As a beginner, one of the best tips I can give is to SLOW DOWN, and don't just go to busting rock. Stop, look the rock over, and try to imagine what your next blow is going to do, and how it will affect the next 3 or 4. Like Ralph told me at OJAM, it's just like a chess game. If you can't look several moves ahead, you aren't going to be very successful.
You guys that have been knapping for several years amaze me at how fast you can go from a big rock to a small point. I just have to keep telling myself that I'm not experienced enough to see what needs to be done that fast. It sometimes takes me several hours to get a rock thinned out enough to be ready to pressure flake, because I have to study the rock before each series of blows, to try and decide how to attack it without messing it up.
I've still got a LOT to learn, but thanks to the tips I'm learning, and getting a chance to watch good knappers, I'm definitely making improvement.
Also, good rock is a definite plus if you want to make a good point, but if you don't have a steady supply, there's nothing wrong with practicing on not so good rock. It's fun to take a big ole' chunk that you know won't make a point, and just see how thin you can get it. Sometimes you will suprise yourself.
And probably the best tip I can give beginners...abrade the heck out of your platforms EVERY TIME.