Need help for engines on a Cooper Prowler 1987

[Cooper87]

Is there somebody that can help me to explain how to change the spark plugs on my two 5,7 Mercruiser engines?

I have access right in between the two engines, but when I want to access the other sides of both engines, I have no room.

What is the trick? Thank you.

[Sailmonkey]

Break your ribs and slide over the top. Once there hook up an IV drip so you can complete the job without moving.