How do I downgrade my MacBook Pro Retina Display from Mountain Lion to Lion?

I have a brand new MacBook Pro Retina Display that came with OS X 10.8.1.
I´m an audio engineer so I work with Pro Tools, tons of plug-ins etc... Some of my software doesn't work with Mountain Lion just yet. Some of them haven't upgraded, and some of them I need to purchase a latest version, which is not cheap at all in the audio world. So I'd like to hang on to Lion for a while until I decide to upgrade everything to Mountain Lion.
I've seen other posts about this -> https://discussions.apple.com/thread/4148927?start=0&tstart=0
This one in particular managed to make the downgrade. However, he used to have OS X 10.7.4 in his retina display when he bought it. Which is something that doesn't happen in my case.
If you read the other post you can see that several methods have been tried.
Is it really safe to completely erase my hard drive and to a clean install of Lion? Will it work perfectly fine on my Retina Display?
I went to one Apple Store, and the guy asked around and told me they haven't done it before, so since they didn't know whether it was going to work they couldn't do it. He told me to do it myself and if something happened to my laptop, "just bring it in and we'll reinstall the stock OS X again."
Since the laptop is brand new I don't mind erasing everything, all my stuff is already backed up.
So help me please?

The short of it is if it came with 10.8.1 you can't install an OS less than that.

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