Can I change the spark plugs on my 99 Ply Voy Se 3.3 myself or is the three on the back side to hard?

I would like to change my spark plugs myself. However, the three plugs located on the back of the engine look quite hard to get to. Is it easier than I think or should I leave it to the experts. I have changed plugs before in other 4 cyl vehicles but none on 6 cyl engine positioned like this. What are your thoughts?Can I change the spark plugs on my 99 Ply Voy Se 3.3 myself or is the three on the back side to hard?Easiest to replace them from under the van.

Pretty challenging with basic tools.

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