The last time I did ours I backed it up close to a tree, unhooked the 3pt hitch arms but left he top link attached.

Took a chain and chained the front of the cutter to the tree and slowly drove the tractor forward. The chains kept the cutter from moving forward and the top ling levered the hitch until it was sitting perpendicular to the tractor. Then I attached straps to the cutter wheel and to the tree and tractor so it could not move.

It was actually pretty easy and very stable when I was through.

I love my country, but don't trust my government.