Apple MacBook Pro 17-inch (original, Core 2 Duo, 2.4GHz, Late 2007 CTO, Early 2008, and Late 2008) - Manual (Page 53)

MacBook Pro 17-inch (original, Core 2 Duo, 2.4/2.6GHz, 2008) Take Apart — Keyboard 53
Use the heel of your hand to hold in place the edge of the keyboard that was just inserted 5.
while holding the top of the keyboard with a finger on that hand, then use your other hand
to help bow in the remaining side of the keyboard until it can be engaged.