Unless you like pain and frustration, try trading. Or, if you can craft the helmet, craft it 4x and convert it.
Or have it crafted.
Since the set pieces do drop randomly, farming the set would take months/years otherwiese. 
Unless you like pain and frustration, try trading. Or, if you can craft the helmet, craft it 4x and convert it.
Or have it crafted.
Since the set pieces do drop randomly, farming the set would take months/years otherwiese.