Indeed true, even when the guys have been around the game a long time, they (the callers) can forget where they are in the sequence and lose their place. But this is the exception rather than the rule

I'd say go back and re-read VKoester's post. It has all the elements in it that you should be aware of. For example, rather than call out the description of a maneuver as explained in the rule book, know or figure out shorthand for the same; you could say "Double I, 1/2 first, full second" for the "Double Immelmann with 1/2 roll after the first half loop, and full roll after the second"