I must have been lucky so far, no one cursed at me yet. Even though I was the cause for a wipe once. I usually ask if there is anything special in the dungeon and let them know that this is my first run at it. Sometimes I even skip the cut scene.
May be good to Google the particular dungeon too just to have an idea what's in there and what to actually kill, although I haven't done that myself yet.
As a rule of thumb I keep in mind to kill everything around the hard to kill boss and let the tank keep the aggro on it. Once nothing spawns any more, let loose on it and kite lots.