Which is to say, Tanking or Healing as the two primary culprits here. Not that I condone waltzing into a heroic as a freshly dinged 80 to 'DPS' without having put any effort in either, but you can do this and get through a run. To a lesser degree you can with healing as well, if the tank is suitably geared. Most difficult of all, tanking. Even if the healer is absolutely wonderful and able to keep you alive, good luck then in keeping agro off everyone else.
I haven't yet finished my take on the topic, but will be sure to link through to it when I have. Feel free to take the idea any way you wish, be it a simple list of gear you can buy cheaply or through to methods of obtaining gear while being something else and their associated ethics (or lack thereof).
Would be very curious to see what others come up with. In this day and age in WoW, it's probably never been easier to do, but yet, it's still not precisely easy, and I see post after post asking how it's done. So have at it!
