No-one ever tells you how to brief for trial lessons, do they? Or they didn't on my FI course. Maybe helicopters are different.
Just reverting back to the original question. An FI Course teaches you how to teach, probably not every exercise because there isn't time but, it equips you with a method you can apply to other exercises.
With any flight exercise, you brief whatever you are going to teach; so that the student knows what they are going to do/see. For a 30 minute flight that won't be much!
Do you really want to be told how to do everything? If so, you probably shouldn't be an instructor in the first place!