The manual dexterity involved in getting the right cues to the right places at the right times requires the development of motor skills which are unique to Cued Speech. Not all would-be practitioners are blessed with the same degree of motokinesthetic sophistication. You may need special help. On the bright side, it should be noted that each of these sub-skills can help to support the others to some degree. The motor movements of cues can help one to perceive vowel phonemes, and a quick mind for categorization can aid in executing perceptual and motor tasks.
Perceptual integrity makes categorization of vowels much easier.
This section of the manual provides not only extensive practice with vowels and diphthongs but also addresses the sub-skills of perception, categorization, and manual dexterity. Conscientious study and regular practice of the units in PG-1 should result in a solid foundation for proficiency. Those with diagnostic information available should probably skip over those units which were not profiled as Error Factors. No one should waste time and effort on practice materials which are too easy.