I saw a course being offered at work and signed up. It was a few hours, pretty quick and painless. I gotta say though, you can pass and still not know what the heck you’re doing, so if you really want to feel confident in an actual emergency, you need to do more than the minimum. Don’t let other people taking things lightly detract from your learning or practice time, and don’t be afraid to call the instructor out on details. Also, if you see people doing things incorrectly or unrealistically and the instructor doesn’t notice or care, point it out. Someone should. Seriously, it’s not rocket surgery.