I just sat up on top of the engine to get at the back ones, sorta laying on my stomach feet off the ground. My arms aren't small or delicate either, I did it no problem. Just have a good extension set on hand, different sizes...i had to put a few odd sizes together to be able to get the ratchet on a few of them. Use a piece of rubber hose on the end of the new plugs to start the thread & avoid cross-threading....
what do you mean a rubber hose on the end of the new plug?
i know what cross threading is but i didnt realize it was something i was going to have to worry about