How do I replace the worn spark plugs in my Audi 80?

I've been experiencing a loss of power and occasional misfires in my Audi 80. I suspect it's due to worn spark plugs. How can I properly replace them to improve performance?

The first step is to purchase new spark plugs that are compatible with your Audi 80 model. Then, using a spark plug socket, carefully remove the old spark plugs and clean the area around them with a cloth. Next, apply a small amount of anti-seize lubricant to the threads of the new spark plugs and carefully screw them into place. Make sure not to over-tighten them as it can damage the engine.