Nice~
I didn't bother with TK but I have soloed the Giant Orc Captain... several times. Mostly because no one else would go into Land of Trials...
and I'm impatient like that.
Really, the only problem with soloing a boss is its "guards" and because you're soloing you'll take longer so... the other mobs sometimes spawn around you again. And of course the bleed/poison/disease...
Uhm... I wouldn't solo Giant Harpy though cause she casts Fear. >.> At least a duo for that one.