Take a look at this video! There are two plugs that are hard to reach. They are the ones nearest the Drivers/Passengers seats.
I changed my Spark Plugs at 30K miles. Amazon had the OEM Beru Plugs (made in France) for $42. I only paid 30 because I had some Amazon purchase points.
Hope this video helps!
https://youtu.be/tA8oiL7PNX0