My guild killed Nefarian for the first time tonight. Almost precisely two months after we killed Ragnaros. This accomplished our major goal of clearing Blackwing Lair before the expansion. So the guild was happy. No shaman loot dropped. So the guild was estatic.
One interesting thing about this guild is that our raid leader spends a lot of time explaining things and going over the fight. He makes us do things like practice running to different spots during transitions. We spent over half an hour going over the full Nefarian strategy. (We earlier spent 15 minutes on Phase 1 only, because the raid leader thought it would take us a few tries to get to Phase 2.) Heh, sometimes I joke that the reason we do well is because we want to avoid going through the lecture again.
But it really works. It's one thing to be told, "When X happens, run to the collapse point", and quite another to actually do it. Actually practicing the moves before the fight starts helps give you an idea of how long the transition will take, and what the range will be like (very important for healers, who need to keep a moving tank alive). Dry runs are a very useful tool, and this is the first guild I've been in that has really made use of them.
 Unlike Ragnaros last week - 2x Ten Storms Legs for the loss. :(