Found a way to solo an elite ( in this case ) 4 levels higher than me, although i also did this when i was 17 with crap gear. This is probably most easiest for a hunter due to their snare abilities and pets, but im sure a warlock could manage it just as easy. I had rested xp but all the same, its alot of xp. I hope this video was worth the 3 bars i gained in killing 2 mobs! Any queries dont hesitate to ask.
[ame="http://www.youtube.com/watch?v=H1cZJf-x0Yw"]YouTube - Stockade Solo[/ame]
Hope this helps.