i have no exp weaving (outside some willow workshop i took)
but i do in peeling bark and heatbending wood.
when you want to peel bark, its always best to cut the branch(or root in this case) in spring when the sap is running just under the bark, it will peel right off usually then depending on type of tree,leaving a nice slick velvety skin to the wood.
heating the wood will ease in bending,the wood has to still be green/wet or at least fairly so.
guess it's equivelent to "steam-bending" basically. you'd normally bend it around a form. this is how they make windsor chairs
here is an interesting video i found on native split root weaving,
http://www.youtube.com/watch?v=szC3LagoFSo enjoy! it's a beautiful art.