The skills that CNA's perform are not any sort of foreign tasks. Everything we do as a CNA are things that relate to every day life. You know how to eat, take a bath, brush your teeth, make a bed, clean up a mess, etc, so now you're just applying those concepts and performing them on other people. Skills such as taking a blood pressure or getting the brief on the patient while they are still in bed are things that you can only master with practice- and no one expects you to be perfect at first (or even close). With time, you will be more comfortable working closely with other people, and more confident with your new skills.