Should I take a class?

I'm wondering if I should take a cake decorating class. I'm self-taught, but I don't think I need to because I have a grasp on how to frost them and how to do borders for the most part. But maybe there's something missing I don't know about. What I would really want to learn about is the recipes like ganache and jam and I know that's not what the class is about. They don't even teach you how to make the frosting that you use.