WoW newbie looking for advice

[TriggerHappy]

Is it actually possible to solo instances? I'm level 23 and yet still can barely handle two level 19 "Elites" in the Whaling Caverns. And that only because Hibernation works on these Raptor type things. But can't progress beyond a certain point as a "boss" there is escorted by a buddy Raptor. They can't be triggered seperately, so whenever I pull one I get the other one too, and just can't handle them. Mostly because the boss is a humanoid caster with some serious nuking power.