Tune up

Hello,

Replacing the plugs on the back side is challenging.
However, there is no special trick to change those. You will have to use a long enough extension and a U joint.
This will help with reaching the back of the plug.
Also, it is a good idea to use a spark plug wire removal tool.

https://www.2carpros.com/articles/how-to-change-spark-plugs

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.