First a scaffold had to be built which could support the ladder needed to reach up to the roof peak from the sloping ground alongside the cabin side. Note the 12-foot long 2x4s used as the supporting legs. Kind of a wobbly set-up.
The photo actually shows the rebuild of that scaffold, for it had already been used one time on the other side of the cabin, then torn-down, nails removed, and the wood used again to construct the same scaffolding on the shown side.
(By the way, that 1st construct was the more solid one. Somehow by the time the pieces were reassembled for the 2nd time, the structure sloped downward more and didn't seem as stable.)
(Oh well, it's all firewood now!)