Need Help Installing Snow Leopard over Mountain Lion!!!!

Hey!!! I REALLY NEED SOME HELP!!! I had Mountain Lion installed on my Macbook Pro. I didnt like it and I wanted to downgrade to Snow leopard. I have the Install Disk with me. I went ahead and formatted my Macbook Pro. Now Im not sure what to do. Should I put the disk in?? And will it install?? And how should i install it??? All I can do as of now is boot into the Recovery HD.

Hi.
I have the same problem with an iMac - everybody gives the same response and none of the them work. Why? Possibly because the iMacs come with bluetooth keyboards and by the time the bluetooth connection has been made, it's too far into the boot sequence for "holding down the C" or "holding Option whilst pressing R", etc. to have any effect.
(Oh yeah, I've tried connecting USB keyboards and they don't work either. - possibly because they are usually Windows and I don't know which keys map to which).
It's bad enough being told to press the "Option" key on an OSX keyboard when there isn't one - at least not on English keyboards. If the Yanks mean the "Alt" key, then they should say so.
I do not get the Installer Utilities options to enable me to clear the old operating system from my hard drive, because I can't find the key combination to force a boot from my DVD drive.
I also get a message that I can't run "the (Snow Leopard?) Installer" on the current software (Mountain Lion) in order to start the regression to Snow Leopard.
So, how do I trash my current system and start again? I suppose that I could always install Windows and then OSX over the top of it. Or take the disk out and start from scratch - but I've done that once and it's a bit boring.
P.S. I was the "Backup Man" at a computer installation, so " Make sure you save this...." goes without saying.
Any different ideas guys?

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