It doesn't look to me like you should really have all that many issues with the maps. Maybe the swarms of paralyzing units? I don't really know how difficult those are to handle compared to the above videos. Really hard for me to judge when I've not done the maps myself.

But I think as long as you can tank and kill a lich, then you should be fine. But between now and the event, I'd be working on getting those silver healers CC and leveled to at least 40. You can't go wrong with more healing power.