How to downgrad from mac OS 10.9 to 10.8?

Hi All,
I have macbook pro 15 Early 2011. I have updated my macbook pro with Mac OS 10.9(Mavericks). After fewdays my macbook become terribly slow. So i decied to downgrade from MAC OS 10.9(Mavericks) to MAC OS 10.8(Mountain Lion).
Please provide me the steps to be followed to the downgrade.
I have downloaded my copy of mountain lion and trying to install but it doesn't allow me to downgrade since my macbook has latest OS.
Please help on this.
Regards
Bhasin

Bhasin,
to downgrade from Mavericks to Mountain Lion, you’ll need to boot into Recovery mode, run Disk Utility there, and completely erase your internal disk. Since you have an Early 2011 model, it  originally came either with Snow Leopard (and two grey installation DVDs in the box) or Lion (and no installation DVDs in the box) installed. If it originally came with Snow Leopard, you’ll need to reïnstall Snow Leopard from its grey Mac OS X Install DVD. If it originally came with Lion, you’ll need to perform an OS X Internet Recovery to redownload Lion from Apple’s servers and reïnstall it. Once either Snow Leopard or Lion is installed, run Software Update; once the OS has been updated, you can then upgrade to Mountain Lion.

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