Ok, well before you read this guide there is 1 thing you must do.
Run to an auction house and check the price of Elementium Ingot, they usually sell for 2k on my server, some servers go as low as 1.5k or as high as 2.6k.
So this is very simple, head over to Black Wing Lair and get to Firemaw, a dragon boss. In his room there are about 60+ Blackwing Technican which have a 9% chance to drop these Ingots.
You get about 4-6 Ingots per clear
Now depending on your class will matter how to fight them.
On a warrior charge a group and WW on them and just keep massive splash damage.
On a DK *the easiest* just run in and Howling Blast / Blood Boil spam. Anti-magic shield after your first Howling Blast.
On a hunter spec BM. Nuff said.
For a paladin prot spec is highly recommended, if using ret you might need to bubble as you run in.
Druid should be bear tank and try and splash the technicians down, other specs will probably fail.
Priest - Run in with everything popped and die. yeah, it doesnt work...
If your class is not listed here it means ether a)Do not try or you will fail or b) its late at night and i cant remember any more classes
Now, you are probably thinking "Durp, how does i get to the mobs, aren't there bosses in the way? Hurrrr". Well yes, but there is only 3 bosses in the way and they can be cleared by easily 5 people.
Question 2 "Doesnt that mean loot is split between 5 people?". No. Once the bosses are down just leave the raid and make a new one with someone who will go offline. This works great with blizzards new raid lockout because it creates 5 new raid ID's.
Question 3 "This takes hours! You lie!". If it takes hours you should read up on the boss fight, and sure it might take 1h to do the bosses, but 15-20min to kill the technicians. Log out for reset. Kill more.
If you are by your self in a raid, just use rXYZ and go straight to the Technicians and skip the bosses.