How do I replace the spark plugs on my Audi A2?

I've noticed my Audi A2 is running rough and I think it's time to replace the spark plugs. How do I properly replace them to ensure optimum performance?

To replace the spark plugs on your Audi A2, first make sure the engine is cool. Locate the spark plug wires and carefully remove them from the spark plugs. Use a spark plug socket and ratchet to remove the old plugs. Then, gap the new spark plugs according to manufacturer specifications and hand-tighten them into place. Reattach the spark plug wires and start the engine to ensure proper installation.