Tips for narrative structure?

I think that fantasy is a hard enough genre to tackle on its own with world building and characterization, action and creatures. I would think that as long as your technique is in place you can write anything. Remember however that some of the best writers (have contemplated changing POV's) were unable to successfully write from several POV's. It isn't easy and sometimes in doing so you change tense, ruin grammar and 'forget' whose head or perspective you're writing from and inadvertently put in information that the wrong character doesn't know.