How many miles are on the car?? If there is less than 75K, the plugs should still be in a good enough condition to not woory ablut them. The hardest part about a plug change is the #6 and #8 plugs. There is not a lot of room to get to them but with a bit of effort, they are doable.
The best way to change plugs is to remove the rear portion of the fenderwell along with the center section. This allows for a pretty much straight shot at all of the driver's side plugs and the forward two on the passenger side. For tools, a 5/8" spark plug socket, a few extensions that total to about 18", a good ratchet with a swivel head and about an 8" handle, and a u-joint extension. They should be 3/8" drive.
Remove the plugs when the heads are cold. If they are hot or warm, you risk stripping the threads in the aluminum heads. Remove the wire boot by twisting a 1/4 turn and pull back carefully. Don't use the wire to pull the boot off!
When you install new plugs, use a good anti-seize compound and torque them to about 11 ft-lbs. Use some dielectric grease on the inside of the boot to help the boot slide over the plug and keep any moisture out.
You didn't mention anything about the cooling system. How old is the coolant? IWhile the Dexcool in the car is advertised for long life, if you have 75K or more miles on the original fill, it might be worth having the old coolant flushed out and refilled with new Dexcool. Don't use the new yellow stuff that is supposed to work as a replacement for all coolants. Dexcool is not much more than the old green stuff or the new stuff. If you do decide on a flush/refill, I would replace the upper and lower radiator hoses.
You can use Havoline (Texaco) Dexcool as that is the same as what GM installs. You will need 2 gallons of coolant and two gallons of distilled water. Remove the overflow tank in the passenger side headlamp well and dump out the old stuff, rinse it clean and fill with a 50-50 mix of new.
Two of the best tools you can take with you is a AAA card and a cell phone! If you aren't a AAA member, look into joining and get the extended towing coverage (100 miles). If your car should break down out in the middle of nowhere, you simply call a toll-free number and roadside assistance shows up. If your car has to be towed, AAA can arrange a flatbed easily. One neat thing about AAA is that the card covers you, not your car. If you are a passenger in a car that breaks down, you just call for assistance, they show up ho help or solve a problem, sign the form and go!
