Re: 5.7 Hemi spark plug replacement
I did mine about 2 months ago, and I also recommend replacing the wires while your at it. Carbon28 has got some good pointers, engine needs to be COLD.
Make sure to use the Copper 570's copper core plugs, they are pre-gapped to the correct setting and they are stupid cheap ($1.50 each) at autozone, which is a good thing since you need 16 of them. Also grab a tube of dielectric grease.
You will need atleast 2 universals for your socket wrench, and a handful of extentions. I picked up a plug socket with a universal ontop for like $10 at sears, it helped alot since the plugs are relatively deep inside.
Be sure to use a torque wrench to get the proper torque. If not tight enough you will have a gas smell inside the cabin.
If replacing the wires aswell, I recommend doing one set of wires and their plugs before moving to the next set, so you dont mix up the firing sequence.
It took me about 30 minutes per cylinder, so about 4 hours. It would probably go faster next time since alot of that time if trying to figure out the best ways to get in and out, running the wires thru the looms and cleaning.