All I'm trying to do is sew the back of a formal dress tighter as it is loose on me. So no, there are no tears or holes at all, I'm just trying to shrink the size. I'm no pro, and I have to do it by hand, but I'd like your opinion on what method would work best. Thanks! 
I'm not too worried about the outcome looking unnoticeable, so don't worry about that.
I'm not too worried about the outcome looking unnoticeable, so don't worry about that.