I would unhook the cables at the calipers and move them. You will need some sort of ratchet clamp or something to hold the calipers closed while you reattach the cables, and then adjust the brakes. You can do it by hand, but easier if you have something to hold the calipers nearly closed while putting the cables back in and retightening. There are special bike tools often called 3rd hand tools that are made for this, but a ratchet clamp works great, is adjustable, and you might just have one around...