Fenders to big, how can I...

My fender are too big for my wheels, I know I have to cut them down and will probably do it with a jig saw but does any one else have any other ideas. I'm going to cut the back side flange off, no worries though I'm not attaching the fender that way I'm attaching them to 1" square tube that will be attached to the chasiss frame.
Thanks, Mike
Thanks, Mike