I would just go in with healer and buff trusts and as much MAB atmas as possible and MAB gear and pull mobs 1 by 1 using Cata to build up Amber lights. If you kill multiple mobs with Cata you only get the amber light of 1 mob. So killing 1 at a time is faster.
Now when you have capped amber you will need high pearl. To do this pull a bunch of mobs and face towards them all and just auto them all to death. Go grab a drink or browse the web while you do so. Then once you have high enough pearl just pull a group and Cataclysm them all to death and watch the large gold chests drop.
Will take a bit of time but like Evildemon said if you get 3 feet you don't need you can go to Abby misereux and talk to the galka at the start (iron eater I think) and you can trade him those 3 feet for a feet of your choice