This isn't quite the same as replacing the magnet on a Peavey. This will require you to cut the old paper out, clean the frame and gap, then install the new one, center with the shims provided, and glue it down. Make sure the leads are on the side facing the terminals!
it's not hard, just take your time and you'll get good results. I would start cleaning up that frame now so that your ready to go when the kit arrives. You can find instructions on the net, or let me know if you want the details. Just be sure to cover the voice coil gap with tape to keep stuff from going in there.