taking the old one off is easy, pry it out with a screwdriver, installing the new one is fairly easy too. line it up and tap it carefully around the circular pattern. it will work its way into place, just make sure its flat.
2001 Celica GT-S Turbo1997 Supra TT 6speed1997 Celica 3MZ/1MZ swap1990 Celica All-Trac
also look in my 7A-FE rebuild thread, i have good pics there too
2001 Celica GT-S Turbo1997 Supra TT 6speed1997 Celica 3MZ/1MZ swap1990 Celica All-Trac