I just replaced my Iridiums with stock plugs the other weekend. Granted I've got semi-pro tools at work, but I did them in about 30 without straining. The worst part is getting the plug boots out, if you've got the right tools. Fine tooth 1/4" ratchet, 3" 1/4 extension, 3/8" adapter, plug socket, and for me a bendy magnet to fish the plugs out because they're too small for the plug socket to grab. Drop the socket in, feed the extension and adapter in, then throw the ratchet on, reverse to remove, possibly with needlenose pliers.
I thought the Iridiums were awesome at first. I'd been chasing a poor idle all last season, and the plugs fixed it right up. I dunno why, but mine did not like 'em at all. I checked them at ~0.030" gap, and they were all nice and tan, but it idled like pure crap and fell flat on its face below 2k, and I mean flat. YMMV. I might give the platinum/iridium NGK Lasers in and see if they're any better, I dunno.