Nail one thing down every knife you make. While I do screw up on every knife, or feel like I do, it's rarely the same thing over and over. More often it's trying new things, or new order of operations.
I don't dick bevels up anymore, not to the point that I can't fix them. So get that nailed down. Early in tradeschool I was squaring up a block in a bridgeport and screwed it up, making a parallelogram instead of a cube. I was going to chuck it and start over, but my instructor stopped me and said "Anyone can do this from scratch. It takes more skill to fix it" and left me to figure out how to straighten it out. That's stuck with me my whole career, sometimes maybe to a detriment as there is such a thing as throwing good money after bad, but when you're learning, I think it's important to fix your mistakes rather than starting over. For two reasons, one, to learn how to fix simple mistakes or how to alter the project to eliminate the mistake, and two, as a punitive exercise in why you should slow down and do things right the first time. Especially when you're the engineer, designer, machinist, grinder and salesman all in one. The knife isn't ruined until you say it's ruined, even if it doesn't turn out as you initially planned because it's shorter, thinner, and has a different profile. So what.
You don't learn anything from chucking something into the scrap bin.