I love tillering. That's when a piece of wood is transformed from a stick to a bow. But, like the rest of you sometimes I "want" to tiller a bow, but the mental faculties are just not there, usually because I'm tired and drained. But, I want to be in the shop working. So, I just go out there and piddle around. I might tidy up the place or work on some less mind tasking other projects. About half the time doing so will revive me and a stave ends up in a vice. Once little yellow curls start falling to the floor, I'm usually good to go. Other times I just have to walk away.
I think aspiring to be a bowyer, is journey of learning about ones self. The wood teaches us more than how to bend it so it will put an arrow in flight. We learn patience, perseverance, disappointment and pride. We also learn our limits. When we,re physically and mentally DONE we learn to call it a day.