Three months to go and this is what I've learned. It doesn't matter how good your intentions are or how much you want a wedding that is personal and that doesn't fit into (m)any stereotypes (bitchy bride, bad food, spending too much money, wearing ridiculous dresses that will never see the light of day again). People are going to bring their preconceived ideas about weddings with them. No matter how hard you try to show them that your wedding won't be _______ (cheesy, a show, extravagant, a waste of money, a waste of time) some people will believe what they are going to believe to the very end. I don't know what it is about weddings that causes some people to go into a tizzy (please read a more eloquent post here). My guess is it has more to do with their own views on marriage or maybe they've just had to wear too many crappy bridesmaid dresses.
The people that matter will know you and your intentions and come to the day (or into the planning process) with an open mind and a helping hand. You'll just have to smile, be polite and tell the others to eff off.