Well I just did mine about 3 weeks ago... and let me tell you... pain in the hand
you won't bleed but you'd better have smaller sized hands. It took my friend and I about an hour to change the plugs and wires. The wire are a complete pain in the neck. You don't have to remove the manifold but it would make it easier to do the job but it will take you about 4 times longer because of the work involved with removing the intake manifold.
I would recommend getting a pair of long handled 45` angled pliers to get the old ones off. Take them off one at a time but make notes at to what number cylinder goes where. That's what I did. It was the only way to get to the bottom part of the coil packs. Anyway take your time to make the note because getting those back on are a PITA and you don't want to have to do it twice
