OK a later car then, I went by the year of the one in your profile.
Toaf, in short = a kind of mobile T4 or alternative, free to use programme requires a cheap KKL lead, use the search facility for more info.
Go ahead and remove the upper inlet manifold, so much better access, change all rear spark plugs at the same time. I recommend removing the manifold as there is an earth lead going to one of the rear coils, if you can't see it and remove it by mistake and then start the car there's a real risk of damaging the cars main ECU (EMU).
Regards
ps There are two hidden brackets supporting the back of the manifold which you've got to remove
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