I think the official AH trainers are to be praised for their efforts, but Vudak's idea is legit as well. I find that any 1-1 with feedback is valuable (wish I could find more of it in this game). If your partner advises "bad habits", I think that will become evident when you try them out, and you will eventually discard them. If not, it's just a game, not life-and-death.