Everytime I go into A Primal Pug or a dungeon without my FC I write at the Start.

Hey there I am Nura your Friendly Blackmage, if you got Questions regarding the dungeon / Fight, feel free to ask and don't fear a kick. I am Glad to help you through the dungeon and looking forward to playing with you.

And then Everyone normaly say Hello and we go.
So I guess it would be ok. If you are not epxerienced with the fight as long as you don't fear to say the truth.