Removal of intake manifold on V8 via Weasel's method?

[TriX5]

Whilst I wait for some transmission parts I have started to size up the top end job. I need to replace the vally pan gasket as it drips royally from the back.

I'll also replace the spark plugs for sure but I got the black plastic covers off the valve covers and there is no sign of oil around the plugs so it seems I can leave the valve cover job for later.

I studied the problem of getting the wiring boxes off the fuel injectors for a while and it seems to me that removing the clips one by one is quite a bit of a pain. Weasel's method seems easier (pull up rail and wiring boxes together) but it requires romoving some of the wires that come off the front of the wiring boxes from the various engine parts they run to. Only then could I lift the wiring/fuel rail up and out of the way enough to get to the manifold and valley pan.

Are there any counter indications to doing this? Should I get new O-rings for the injectors?

If I remove the coils to get the plugs out, is there any risk of damaging the coils packs?