The hardest part is committing to take the course. Once you begin, you will wonder why it took so long to do it. The right instructor will do everything possible to make the course enjoyable, and build you confidence. It will be different, you have been told all your life to hold your breath underwater and the instructor tells you to breath. Try and relax, do everything very slow and deliberate. After your certification, go diving on an island asap. Don't get rusty, the more you dive the better you will be at it. Enjoy the opportunity, you are about to join a very special group of people.