I am shooting my FIRST wedding for a friend soon and want to be prepared. I have the 55-250mm lens and 18-55mm lens my camera package came with. These have treated me well throughout my portrait sessions and during a few events! I am by no means a professional photographer, and the client (a current portrait session client/friend) knows that this will be my first wedding. I have enough money, hopefully, to invest in one new lens. What lens do you recommend for my crop-censored camera? Not only am I looking for recommendations, but any helpful hints and words of encouragement would be appreciated too. Thanks in advance! ...we all start somewhere, right?!