I read this paper a few years back and it was fascinating.
Bryce, I found one tree, too, down by Nephi, and I THINK one way out west, near the Blue Mountains.
When I harvested a few staves the same way, I just sawed partially through each end of the stave, on the top side of a long, sprawling lower limb of a big juniper. If you leave it a while (weeks) and come back, you can just lean on the tip of the limb out past the second cut, and the stave 90% pops off as the limb bends. It's easy to pull or lever it free.