I'd like to help my guild earn the Guild Glory of the Cataclysm Raider achievement, but I never experienced that content. On the other hand due to the nature of the achievement, we'd be at least eight level 90s doing early Cataclysm raiding.
I assume we should be able to zerg most of the bosses, but I'd like to make sure I know what I'm getting into before getting others involved. Are there mechanics that could still cause trouble to a group of max level characters? Should I try to get at least a healer and tank, or can we run in with only dps? Is there anything else that could trip us up that I'm not aware of?