Since most peoples only contact with professional photography is at their and other peoples weddings, the popular perception is that you aren't a proper photographer unless you do them and that it validates your status and ability if you do.
I.M.O. the first question you should ask yourself as a novice before accepting a paying wedding is "what am I going to do if it all goes wrong and the brides parents sue me ? ", and even if you do it for free for close friends or family whatever they say before the wedding they will still have expectations of a competent job in my experience.