I triple box, three shamans. I do instances with a Tank and Healer played by two seperate people. I could not solo most instances though. Even non-heroic level 80 instances are a bit of a challenge to go through. But with two other people I have three boxed every 80 heroic except occulus, most of the Ulduar fights, all of Naxx, Malygos, and Three Drake Sarth on 25 man mode.