I have one word -- patience
(And I don't have enough to untangle the whole hank.) I only used hanks a few times, my LYS let me use their ball winder and also they taught me to do it by hand without the tangling nightmare.
If it helps anyone -- next time when you untie the hank, wrap it around your lap and keep the tension with your knees. From my experience even normal wool tangles when it just sits there without some kind of holder be it a niddy-noddy, spouses' hands, back of the chair or whatever.