records yourself giving instructions of something you’re reletively good at, then rewatch the video several times, pick up on things you said wrong, times you stuttered. Try and listen for any mannerisms or bad figures of speech you give.
Try and think how you could improve on what you said. Try and find ways someone could hear what you say and misinterpret it or follow them incorrectly, as great communicators listen to what is being told to them as much as they say things well.