A little help

If I'm planning on watching the Television series Firefly at some point, how important to my enjoyment of it is whether I see it before or after Serenity? One might wonder how anyone know the answer to this without having seen Serenity, which has yet to be screened besides for a few sneak previews. I don't know the answer to that either. Also, I'm presumably seeing Serenity next weekend unless I discover that it's cruical to my enjoyment of Firefly not to do so. Oh, and I am (like all right thinking people) a Joss Whedon fan.