I spilt wine on my macbook and it destroyed the keyboard. I had to use a USB keyboard for years until I somehow came upon this fix it site. My curiosity was peaked. I saw I could purchase the keyboard separate so I ordered it along with the dual hard drive enclosure to replace my defunct optical drive. I also ordered 16 GB of ram and a 480GB SSD drive to upgrade the current components.
I would be blind going at this alone, but with this site's extremely easy to follow guide I replaced my unibody keyboard, swapped out my optical drive with a dual HDD (which used to be the original hard drive), upgraded my ram from 2GB up to 16GB and changed my HDD to an SSD. I was ready to scrap this macbook, but because of this site my macbook is working like new and fully upgraded.
My advice is to simply use a muffin tin to seperate screws for each step to not mix them up. Otherwise follow the guide and it should be really easy. Saved lots of money by fixing it myself. The only hard part (but not really hard) was making an exact bootable copy of the existing hard drive to the new one.