you should trim/square up your quilt before attaching the binding, then some people stitch the binding to the front and turn to the back to hand stitch down, others do it the other way, as in stitched to the back and folded to the front. i always hand stitch mine, i've tried machine attaching a couple times and am never happy with the results and it sucks to take it out...but that is just me. check out the binding tutorial, it is very helpful :)