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I did the hard way and reached back there and did it myself but it took a couple hours and a lot of work to get to them. I've been told to undo the front motor mounts and with a hydraulic jack, jack the front of the engine down far enough to see the back 3 plugs, but I didn't try that.
A lot of the Gran Prix V-6 (beginning with 3.1 litre v-6 transaxles)models have "dog bone" motor mounts on the front side of the engine. Disconnect these (don't worry the engine is sitting on the transaxle, and it won't fall.) Once the mounts are disconnected you can insert a length of 2x4 between the engine and firewall and rotate the engine forward by using leverage. It will turn with the front drive axle. Just prop the 2x4 in the position you want to hold the engine. Sometimes, depending on your options you may have to disconnect the radiator hoses, but not always. You can usually tell just by looking. Once you have changed the plugs, release the 2x4 and the engine will rotate back to the original position. Reconnect the motor mounts (and radiator hoses if required)and, VOILA! You're done. I've done this several times and it sure beats the labor charge the shop wants to reach those plugs. Got this tip from a Pontiac mechanic.
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You must loosen the top motor mount and tilt the engine forward.
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