Laptop Key Broken,… Changing The Keyboard.

Hi,.. one of my keys on my laptop have broken. And i’ve found a company who can supply me a new keyboard. Although if there going to fix it for me, it’s going to cost a fortune!…

I have a “Toshiba Equium L20 – 198”

But not being a computer person as such, i’m unsure on how to change it myself. Can anybody help me out..