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Best plugs to use are the manufacturers. Found this to be true on my Toyota 33re engine and various Fords. Also read over the years tests and reviews and they all came to the same conclusion- OEM plugs (and brake pads) work best.
The spark plugs are underneath that cover on top of the engine (should say VVTi on the cover).
Just take that cover off, and then you will see the four ignition coils. Take off the four ignition coils (with igniters), and you will see the four relatively long holes underneath, and the spark plugs are at the bottom of those holes. You will need a good spark plug socket (preferably a thin wall socket) and a 6" or 12" extension. This is actually a very easy job, and can be completed in less than an hour.
Hope this helps.