How to Change Spark Plugs on Audi TT Mk2 NGK PFR7S8EG

This is how I've changed spark plugs on Audi TT Mk2 2.0 tfsi (2007).
To properly maintain your car, spark plugs should be regularly changed, approx. every 50.000 km.
NGK Spark plugs
Part number: PFR7S8EG