e320 spark plugs

[dan.buldini]

Hello All, I need a knowlege transfer concerning the spark plugs in my E 320, V6. Two things this engine has 12 plugs. I bought Bosche 4 pole platinum plugs from Auto Zone, they gave me 6, but now I look at the engine and it has 2 per cyl. please confirm. Also I have tried to pull the leads off of the plugs and they will not come loose. I don't want to break the old plugs off in the block. Is there a catrch release I can not see? The plugs are buried on both heads. The leads from the coils go a long way down the heads.
Please help, has any one done these before, I need advice before I break something.