How do I resinstall Lion from Time Machine if Mountain Lion upgrade fails?

Hi,
I've used Time Machine to take a full copy of my Lion OS with all the settings etc and would like to upgrade to Mountain Lion. However, I've read some mixed reviews on ML and if I need to downgrade to Lion how would I go about this?
I've only recently moved over from Windows since 24th May this year so any help is most appreciated. So far Lion has been a complete and utter joy compared to the clunkiness of Windows so I can only hope that ML is the same.
Many thanks.
Martin

Don't use TM for this, make a bootable clone of your drive (you can use Disk Utility, Carbon Copy Cloner or SuperDuper), if the upgrade is not to your liking you can restore (or just boot from the Snow Leopard drive) whenever you want

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How do I resinstall Lion from Time Machine if Mountain Lion upgrade fails?

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