For those cruising this thread, I want to encourage you to consider taking Rescue Diver as soon as you are ready.
It's one of the best classes you can take post Open Water for both enjoyment, education, and skills.
Like one of my instructor friends says, "If I ask you to do a standing long jump, you won't know how far you can do it unless you try. This class not only get's you to try, but try a bit harder to jump that much longer."
The skills you learn are invaluable and help you not only prevent an accident from occuring, but deal with it once it has occured
It's a great experience and one all divers should do.