I keep the Regen slapped on from my druid but for 1-47 I invite the bard before the pull and have him singing Psalm of Veeshan and War March. I go round up the mobs and when I run back to the bard/druid as soon as I see the song icons going I disband and everything gets hit for the 1k and dies before the ticks wear off.
Sometimes if I have to wait for the songs to refresh I lose a couple mobs but stuff still dies awfully fast.
and then yeah 47+ just play what you're playing and train it up