I find that when I am trying to do something I benefit from taking a break from it for awhile and then coming back to it. Seems to give my mind time to process what I have learned. I don't do a lot of knapping but the process of stopping and letting what I have learned sink in has helped me, especially in not getting too frustrated.
I started to do some knapping again a few weeks ago after a break of several months. My points were not too bad before but I have improved my technique a bit and my points are quite a bit better. One of the things I learned over the last week or so is making my points extremely sharp. The pressure flaking method I am using for this is to flick the tip of my flaker upwards gently at the point I am going to take a flake off before I remove a flake. This seems to remove any loose little bits that can give me problems. I don't know if anyone else does this but it works quite well for me.