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Is it metallic but not aluminum? If yes, rotate the engine until the piston is at the top of the cylinder then remove the sparkplug and insert a rod with a magnetized tip to remove it. If it is non-metallic do the same thing but use a piece of wire e.g wire clothes hangar, and bend the tip 90 degrees to fit through the sparkplug hole.
Those are as easy as they come these days.
Mark each spark plug wire with a piece of tape with the cylinder # written on it, so as not to mix up the wires.
Remove each spark plug wire by firmly grasping the wire by the boot (do not pull on the wire) and twist it back and forth a few times while pulling slowly. It should pop off without a great deal of effort. If it is seized and it breaks, you will have to replace the wire, or at the very least replace the terminals (if you can get some).
Use an air hose and blow around the base of each spark plug to dislodge any loose dirt that could fall into the cylinders (not absolutely necessary, but a good idea).
Remove each spark plug with a spark plug socket and extension and ratchet (I forget which size socket, it's either 5/8 or 13/16).
Check the gaps of each new spark plug (typically around 0.035 in).
re-install each new spark plug by hand (do not cross-thread them) and once you have ensured that the plug is threaded in properly, tighten the plug until it seats, and then tighten an additional 1/16 of a turn. Repeat this for the remaining plugs.
Re-install wires to the corresponding spark plugs.
there is a flat plastic box between the dohc that says ecotec on it. it is to the left of the oil fill cap. there are four fasteners on it i believe... possibly two... but remove them and you might have to bend the steel bracket that is above it out of the way to pull it off. it is important to pull straight up as the spark plug boots are attached to the cover and need to be un-seated. once that is off put a spark plug socket on the spark plugs (they have foam inserts to hold the plug from falling out) or use a regular deep socket and once loose take a small piece of tubing or hose and stick it on top of the spark plug, then unscrew it with the tube. to reinstall either use a sparkplug socket or use the tube to start the threads... DO NOT CROSS THREAD and DO NOT OVERTIGHTEN. try to remember how tight they were when you took them out. then push the cover back on making sure the boots line up with the plugs and reattach with the fasteners and bend that steel bracket back down.
good luck if you need further assistance let me know
To change the plugs, do one at a time so not to mix up the sparkplug wires, remove plug wire from a plug, use sparkplug socket to remove the sparkplug make sure to gap new plugs, ask parts store for the gap setting they will give it to you when plugs are bought, the plug gapper is about $2.00. and that about it, the rear plugs are a little harder to get to but the same way to remove, some buicks came with metal heat sheild over the sparkplug boot in the rear cylinders make sure to reuse, you will know if you have them they will slide right off old boot.