instructions for replacing keyboard hardware/where to buy keyboard hardware

Hi!

Could someone kindly recommend the best source for instructions on replacing keyboard hardware.

And also the best place to buy the hardware?

Specs--

Apple MacBook "Core 2 Duo" 2.0 13" (White-SR) Specs

Identifiers: Late 2007 - MB061LL/

Apple MacBook "Core 2 Duo" 2.0 13-Inch (White - Late 2007/Santa Rosa) features a 2.0 GHz Intel "Core 2 Duo" processor (T7300), with two independent processor "cores" on a single silicon chip, a 4 MB shared "on chip" level 2 cache, an 800 MHz frontside bus,

Thank you for your time,

MacBook