Len,
Just remove the firewall rubber seal, lift up at the clips and gently pry pad away from firewall, it has adhesive on the backside. If you still have the emission dashpots on the firewall remove them first. The new one fits around the overflow tank but removing it makes installation easier. I set it in place and then sprayed adhesive to the driver side of the pad and the firewall, let it stand five minutes, shot some more and then pressed into place. Repeat for passenger side, pretty easy.
Chris