actually, it's quite doable, if you've done some models in your software before.
I'm a noob myself, and currently working on the jedi starfighter model from simplymaya, modelling it in lightwave.
so far I found no real big problems.
lightwave doesn't use nurbs, but sub-d's ( on the tab button ), that's the biggest difference I've found so far.
I find it a learning experience, and that's what matters anyway