As the first step, eat some cooked food with BUFF effects, drink potions under this Buff condition. Next install the Sharpening Stone or Weight stone to your weapon. At last, buff yourself with Bloodrage and Battle Shout adding attacking power.
When everything is set, choose a single target (taking care one mob each time is always secure and easy) to kill. Under a special situation like facing gathered mobs, you may use ranged weapon managing Aggro (Note: When there is a caster around, get out of the target's range and make it follow). It is usually easy to take care of a couple of mobs; several or more mobs may force you to choose between fighting with AOC abilities and fleeing away. Certainly, that depends on how strong the mobs are.