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...As long as you have the right length extensions its a cake job....
I imagine ones definition of cake job a matter of interpretation and degree. For me, I'd think the four cylinder to be a "cake job". The topic engine while a very doable diy, does require a tad more time and effort on rearward bank. I found having two 3" extensions on hand helpful. There is adequate space to access the plugs though. Having done it once now, obviously the next time would be easier.
Otoh, looking at the previously mentioned Camry V6, 'relatively speaking' the Honda a "cake job".