So I just tanked a +7 Nelth's lair. My tanking toon is a blood DK, and holy shit, I felt like a failure. The DPS kept pulling aggro and dying. My solution was to pull one group at a time instead of racing through the instance as fast as possible (as per all keystone dungeons). We made it through with 2 chests, but the DPS still died more than a few times despite my best efforts to hold aggro.
Any tips on tanking skittish dungeons? How do I deal with the fact that I am simply not going to be able to hold aggro?