Model Swap with WoD to MOP 5.4.8

[xjurassic]

How to make a mod for WOW MOP 5.4.8

We need to replace the model of the helmet. helmet model should be for men worgen.

Here need it http://www.wowhead.com/item=31110/dr...f-second-sight

replace it this http://www.wowhead.com/item=115858/p...-wyrmhide-helm

how to do it? whether or guide.

or who would have me do?


PS. I will be very grateful, if someone else will take up the case and help me with modeling