MacBook 2009 10.6.8 not booting up after failed Yosemite update?

Hi Guys,
I have a 10.6.8 Snow Leopard 2009 model Mac and have recently tried updating to Yosemite. After restarting and going through the actual installation process, I received the error 'file system verify or repair failed'. I then tried restarting the whole process again to see if it would work, and again it did not. I then used Disk Utility after the error popped up (as I was still able to launch it from the install program) and when I tried to verify the disk, it told me I needed to repair it. The repair disk button was greyed out however, so I assumed I'd need to boot it in recovery mode in order to repair it.
One big point to mention is that I DID NOT BACK UP MY COMPUTER BEFOREHAND. I know it was stupid not to before I tried to install Yosemite, but what's done is done.
So my question is: how do I boot into recovery mode and save my mac?? Is there any way of reverting the whole Yosemite installation process and going back to Snow Leopard??
Many thanks,
Bill

Do you have another Mac or access to one? Could use the optical drive of the other Mac in Firewire Target Disk Mode.
http://support.apple.com/kb/HT1661

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