There-in lies the very crux of the entire issue. You train to learn and develop techniques and skills to deal with a scenario. You will not know it going in, but you will LEARN it coming out!! This is a class!!! This is where you start to develop the skills used in scuba diving. It just happens to be a life saving class, not an insignificant math or science class! If you have not heard this before, let me say it now. These certifications are a license to learn You now have the basic knowledge to DEVELOP the skills to become a better diver!! None of us rolled off the boat the first time with all the knowledge and skill, we developed these things. AND WE ARE ALL, STILL LEARNING!!!!!
What am I trying to say? (very poorly!) RELAX!!!! You have been given the tools that must be practised, to be come proficient.