thinking of changing my name.... my family will be shocked!

I am one of those brides who was adamant that I would never change my name. However, I am beginning to play with the idea of using my last name as my middle name and taking FH's last name as my own. I have pretty much ignored all the posts regarding name changing up til now - an act I am beginning to regret! Is there a website or something that I can consult to determine just how much work this might be?

Thanks!!