Spark plugs are a very easy job on these engines. There are 6 coil packs on the top of the engine, 3 on each valve cover. Remove them and the spark plugs will be underneath.
You will need a T25 torx bit for the coil pack bolts (3.2/3.5 engines), and IIRC its an 8mm socket you will need for the 2.7. There are two bolts on each coil. Be careful if you have the torx bolts, they are easy to strip out.
The plugs are 5/8, you will need an 8" extension and deep well spark plug socket with the rubber holder inside so you can get the plugs out of the heads.
There are no wires to replace, although there are coil boots that you can replace as part of a tune up. I have always used Champion plugs, and have had good luck with them.
Check your air filter, pcv, change the oil, and check your coolant and transmission fluid while your there.
If you are nearing 100K miles, it might be time to change your timing belt/water pump if you have a 3.2/3.5, or your chain and pump if you have 2.7.
I guess I should have mentioned that I have a 2.7L engine. So from what you've told me, I can just take off the coil packs using an 8mm socket wrench, followed by a 5/8" for the plugs with an 8" extend. That's it? Sounds pretty easy.
I do understand that the engine must be cool b4 doing this, but is there any other advice so that I don't damage anything? I heard I need some sort of rubber adapter to insert and start the plugs? Where can I get this, or do I need it?
As for the plugs, the reason I asked about autolite was that I was going to get them at Wal-Mart, and that is all they sell besides Bosch, but I read on here that Bosch is crap. I don't want to spend a lot, so I guess I'll go with Champion..
Finally, I just had the chain and pump replaced last month, as my car died...$1700bucks!!! Hence why I'm more firm on trying to do this myself. Don't want to give those guys anymore money. Everything else you listed I've done. Maybe I'll try the seafoam thing. I've read about it, but I don't want to if I don't have to.
OH last question at this time...do I need a torque wrench to set the plugs or just go until they are tight?