I've been stuck on The Three Trials for a little while now. I play one handed solo progressive, and I know this particular quest is not friendly for one handed play, but that's the way I play. I know it is possible, because I've read others in the community who have done it. I've been using variations of this deck here:
https://masteroflore.wordpress.com/2014/08/04/theme-deck-the-three-trials/
I just want to say I find this whole process incredibly annoying. Yeah, if I keep at it, I'm sure I will beat it at some point. But what makes it no fun at all is I know I'm just waiting for luck to bring about the right combination of encounter card draws (and random guardian/barrow combinations) that will let me win. I might as well be rolling a couple of dice hoping to get boxcars. Maybe the supposed LOTR LCG grandmasters can beat this quest 95% of the time, but I'd like to see how they do it. I doubt very much that it's one handed. For some reason, this is one of the favorite quests from the Ring-Master cycle, from what I've read, but I'm not seeing it.