How to re-install mavericks from yosimite

So my friend just download yosimite, and now his pro is about to keel over and die. we need to go back to mavericks. I just wanna make sure i dont do anything rash or jump into something that cant be done. please help us. we have been researching ourselves but nothing is direct enough. please someone help us.

Hello clay1989,
Thanks for using Apple Support Communities.
If you'd like to restore from a previous backup made with OS X Mavericks to revert from Yosemite, please follow the steps in the article below.
OS X Mavericks: Revert to a previous OS X version
Take care,
Alex H.

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