Step 10: Cutting Corners
No, I'm not slashing my wrist. Don't slash yours. And don't splash boiling water anywhere it shouldn't be.
I'm "tillering" the rib, which means shaving the inside of the bend where I want it to bend more.
Then dip in the boiling water, bend over your knees, tighten the bowstring, tiller it some more, then back in the water, repeat repeat repeat.
Until suddenly you realize it's done and looks like it's supposed to.