I just did 2 of mine. First be sure not to bend the new rubber strips! Mine were so bad I could pull the rubber off by hand with the metal strip still in the clips.
1st use a putty knife and pry up the metal trim. Then pull the old seal out of the metal clips that hold the seal on the door. If really bad the old rubber my come off and leave the metal from the inside of the rubber still in the clips. BE SURE TO TAKE THE OLD MEATAL OUT! Don't ask me how I know this
. Then simply put the new rubber strip in and replace the trim. To do the rear windows(much shorter) I used a saw to cut the strip to the propper length keeping the same profile on the end. The whole project is really not hard just use common sense. I think ******** in Phoenix has the best prices. HTH JEFF