Just in case there's any confusion:
1) unplug the spark wires from the coil packs (two black boxes on top of the valve cover).
2) Remove wires by pulling up.
3) Unscrew two bolts holding each coil pack down.
4) Remove coil packs by pulling up.
5) Using extension and sparkplug socket, remove plugs.
6) Put new plugs in, tighten to 18 lb/ft (I just hand tighten, and then give a quarter-turn with the wrench)
7) Replace everything in opposite order.
8) Go have a beer.
You can use diaelectric grease if you wish. I do every now and again. Your only realy worry is over-tighening a plug and stripping the threads, so don't do that.