Ok if your unsure of your kiting skills, Ive found a way to help you. This requires you be lvl 30. Ok this is the way I devised it for mages. Run rotgut on normal. Practice running the the center of rotgut using ring of fire then running back out. Essentially your goal is to do it until your able to do one full run with one or no deaths. Now of course it usually can be done but u must limit yourself to no potions ok? It will be hard at first but Ive got it down/ Good luck!