Michael,
Welcome to ALR. I had similar questions when I received my first barrel. I used an old large Stillson pipe wrench with brass liners on the jaws. The taper on the jaws matched the taper on the lug when attacking it from the bottom.
Once out, I thinly coated the threads with a mixture of powdered graphite and petroleum jelly, as recommended in Shumway's Recreating the American Longrifle. Made subsequent removals much easier.
Good luck, Bill