Practice.lol. It also helps when you have a decent design for the materials. I used a basic design, Ideveloped for similar materials with the same specs. So I got in the ball park when I cut out the stave. And with practice, you will start to learn where to, and where not to remove wood. Once I get a bow on a short string, it goes much faster. During floor/long string tillering, I just make sure the limbs are bending equally so they dont blow up getting to brace.Once at brace, it goes much quicker. Especially with that little tool I showed you.