front seat reupholstery

I am thinking about recovering my 911SC front seats. Looks like I can get front seat kits from World Upholstery or Autos International. Anyone ever done this? Is it a fairly straightforward DIY, looks like it would be? I know I also need to replace the foam when I strip off the old seat coverings, mine is completely broken down, I assume that will peel off and the new ones glue on. Neither site has any instructions for how to do it.