The first link is a pretty good place to start but you will have to dig a little to get the instructions for the version of mac os that you have.
The second link gives you some suggestions and other links to tutorials that may help you out. This is a tough thing to find and from the little bit that i read on it, it's not an easy task to do.
I am not a mac person but i do love Linux. I use Linux as my primary OS and use Windows only 10% of the time.
