Actually, wasn’t as bad as it looked. Our bittersweet out-vined its trellis. Bill repurposed an old gate made from iron and woven wire into an extension. He leaned a ladder against the tree, loaded the gate and a chain into the tractor bucket, then drove close to the tree and raised the bucket. He climbed up the ladder and stepped over to the bucket. That was the worst part because the bucket is pretty secure, as long as the tractor hydraulics hold. He tossed the chain over the tree branch and fastened both ends to the gate in several places. Then, he climbed back down and secured the bottom of the gate to the existing trellis with—what else?—baling wire. We untangled the doubled over bittersweet vines and wound them through the woven wire on the gate.
I noticed green berries on the vines, so maybe we'll have a little bittersweet this year.