I feel like Tim's is the best advice I've seen so far, other than "leave it alone".
You never transplant during spring/summer seasons if you can help it, only transplant established plants at the end of fall to mid-winter, when the plant is entering dormancy. If you try to transplant now, the damage that you will inevitably do to the roots will leave the plant unable to supply enough water to the leaves, which are well developed and need a lot of water. The plant will go into transplant shock, drop all of its leaves, and some plants won't ever recover. This is not a concern if you transplant during dormancy, because there is no foliage to support.
If it were my choice, I would wait till early January (no risk of warm-ups like you have in late fall), dig that joker up starting about 18" from the trunk and toss it in a suitable pot or its new in-ground location. The tree will be fully dormant, so it won't have leaves to pump water to, and it can focus on root production before the new leaves come in.
Because this tree looks like it hasn't been pruned very well, and could have a really interesting form, I would probably cut any branches off that aren't "desirable" to the shape - but I wouldn't do this for any reason but aesthetics, since it looks like it's never been pruned.
I also wouldn't touch anything larger than 1" in diameter when pruning, just out of personal preference (takes forever to heal, looks bad until it does).
If you absolutely must dig it up now to save it, prune it back heavily, dig up as much roots as you can get your hands on, repot it, bag it and put it in a shady location with lots of indirect sunlight (no direct sunlight, period)