weddingband

hi i am 31yr old from uk having my band done on 31st oct 2010 current bmi is 32 want to lose 4 stones hopefully in 6 months as im getting married in 2011 and want to order my dress !!! im really scared more of not suceeding than of the operation would lve some support or a buddy !!!

does having a lowish starting bmi mean i wont lose as much weight ?