For less work on the modeller, you can download either the high or low poly versions of the Warglaive of Azzinoth (if it's a unit, go for low poly. If hero, and there won't be a second one of it, go for the high poly one.)
Then go to the object editor and practice adding attatchments to your units. Can't remember what it's called, "Art - Attachments" I think. For the locations, if you put the left hand Glaive in first, the string you want is "left hand, right hand" If the right handed one is first, "right hand, left hand".
Hope that helps.