Yes, when you are working with students who have not learned this method and who have not otherwise mastered spatial concepts, problem solving and hand skills, you may not be successful. You don’t have the time and the student has no foundation for using this method.
Have parents and other regular staff get the program started (with Hand Lotion program in his daily schedule) Once they establish this way of learning, your job will be easier.
Teach parents and other regular staff the other aspects of a Hand Under Hand program so that the student gets the daily practice. Then you can introduce new skills to the student and his family or educational staff more easily.
If a child has usable hearing, later on you may not even need Hand Under Hand because spatial language will be more meaningful and we will be more successful talking them through a task.
We all get caught up in getting the task done and we rush the students by telling them what to do or by picking up their hands (Hand Over Hand) to manipulate them through the task.
We rob students of neat learning experiences all the time. It will appear new to you because you are changing old habits, too.