How to change spark plugs on 1998 gmc safari?

I want to tune up my van so I took off the housing covering the engine inside my van and I can see the plugs but how do I get to them to change them?
How to change spark plugs on 1998 gmc safari?
A good assortment of tools. Some you can get to through wheelwell, some from underneath, and some from inside of van after removal of doghouse.

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