I did all these as a PLD and my first words in group each time were "This is my first time doing x dungeon" or "This is my first time doing ARR's version of this place". My experience was fine, but then I also found all of the story and low level side dungeons to be a breeze.

Same for Admapor in which my first couple of runs did not involve training or rushing.

Now I know the place inside out whenever my static of 3 gets a member who hasn't done it before I carefully explain each fight and help them learn. Gotta give a little back