I guess I do. Mei in particular has a tendency to walk up in front of me, which at times can get not only annoying but also impractical. I usually raise my hand and say "wait" or "hang on".
The Lad has a tendency to sporadically bite (extremely frustrating), and I can often tell when he's about to do it. When he seems about to do it, I make him aware that he preferably shouldn't by waving a finger or my whole hand at him alog with a calm "noooo, Lad", or similar. I still haven't figured out how to phase his biting out altogether, but at least this makes him think twice before doing it. He probably does it out of frustration or impatience, which I try to listen to.
Setting your horse up not to fail is really important - imo it's always better to get positive experiences rather than face problematic ones, especially if it is something within your control. I don't want to make it harder or more challenging for my horse than it needs to be.