Don't mean to offend Dan, but that's why I personally will not tank an instance on Heroic before I've done it on normal. Why is why I've still not been to Gundrak, Oculus or Halls of Stone.
Back on Topic: Went to Naxx10 for the first time Friday, as an OT. We did Arachnid and Plague Wings.
None of the wipes we had (our GL was babysitting 9 of us who had never been) was my fault, which is somewhat of an accomplishment, I guess :)
Nobody (except me) tried to kill any of the scarabs on Anub, which meant after a while that I had ~20-50 of the things on me, and I went down FAST after that. My DPS was very high after a Pest+KM'ed HB though :D
The only other (boss) wipe was on Grand Widow, because as I was tanking the Worshippers, another DK, despite our shouts, decided to start killing them. MT went down, I picked her up, and we stayed alive until she enraged for the third time, after which the healers just ran out of gas.
Other than that, it was a fairly uneventful run. We had 7 plate wearers in the raid, and all that dropped was a bunch of Leather/Cloth, so nobody except a DPS warrior who got, I think, the shoulder token from Heigan, got any class-appropriate gear, but we DO now have a priest armed with
this :D