Nothing brings a healer down more than realizing that he screwed up. It gets worse when the healing lead is the one who messes up such a simple oversight. I'm really beating myself up over this, because it was such an easy fix. In fact, it should be the first thing that should be checked before entering encounters.
I'm going to share the conversation I had here with my fellow columnist Joe Perez. I hoped that confessing to him might help alleviate the despair. (It didn't.)
Matt: Hey Joe, can we talk for a sec? I think I goofed yesterday.
Joe: Again? What did you do this time, son?
Matt: ... I uh, forgot to put the resto shaman in the healer group.
Joe: <10 seconds of silence> ... You know how bad that is, right?
Matt: Yeah. Realized it after the fact. I'm surprised the WoW Insider editors haven't fired me yet for making such a rookie mistake.
Joe: I think you need a re-education. Take a seat.
By the way, my guild scored the Critter Kill Squad achievement finally. Next step? Crittergeddon.
Personally, I've found mana management in 25-player raids to be far more forgiving in comparison to 10-man raids. Would you agree with that? I'm basing this on my own experience, but it does make sense. With more raid slots, it means there is a higher likelihood that additional players can be brought in for mana cooldowns.