Yeah, at like level 16. But you can't kill Alduin in that mission anyway. Just deal damage to him until he goes away. Try to stay behind him and don't use ice or fire magic.

Anyway, i'm just gonna level up some more and try to do it.
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Aye. I just keep trying, never turn down the difficulty. Too damn stubborn 
Right now I play as a cat thingy with a very nice cat mustasche. And ear rings.
I basically only use magic but ocationally I use one handed swords and maces.
I don't wear any armor. I never buy anything unless it's lockpicks and I don't allow myself to use smithing or enchanting stuff. At level 31 now and normal difficulty. No companion (since they're so damn annoying).
It's pretty hard.
Right now I play as a cat thingy with a very nice cat mustasche. And ear rings.
I basically only use magic but ocationally I use one handed swords and maces.
I don't wear any armor. I never buy anything unless it's lockpicks and I don't allow myself to use smithing or enchanting stuff. At level 31 now and normal difficulty. No companion (since they're so damn annoying).
It's pretty hard.
