magnus has it. i split my feathers with a pocket knife , then shave them with razor blades. the construstion type , not the shaving ones even though that might work.
once you get the quill shaved off , a quick swipe over a countertop edge or dowel rod will snap the remaining quill and let it bend.
i have found sticking them over a boiling kettle to help , but hte feathers i use are craft(crap) store feathers , and the dye makes a mess when steamed.
the main thing is to get the pith out of the middle .its when i fail to do this , they snap and come apart.
soaking may also help.
been thinking of using goose biots for flu flu's , but those barbs on a biot would probably hurt like a mofo..
-hov