How to check and replace the spark plugs in an Audi A4?

I've been experiencing some engine misfires and I suspect it might be due to worn spark plugs. How can I properly check them and replace them if needed in my Audi A4?

To check and replace the spark plugs on your Audi A4, follow these steps: 1. Locate the spark plugs - they are typically located on the top of the engine and covered by individual ignition coils. 2. Remove the ignition coil from the spark plug. 3. Use a spark plug socket and ratchet to remove the spark plug. 4. Check the gap of the new spark plug and adjust if necessary. 5. Install the new spark plug and reattach the ignition coil. Repeat for the remaining spark plugs. 6. Be sure to use a dielectric grease on the ignition coil boot to prevent moisture and corrosion.