[Q] Installing ICS on HTC Desire (rooted)

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http://forum.xda-developers.com – Hi all, I'm having issues with getting ICS onto my HTC Desire. I have searched the forums, however can't find any easy-to-follow steps when it comes to doing this. I am running Gingerbread, and have rooted my device using unrEVOked 3. I have the ICS image zip file for the HTC Desire. I copied this to the SD card, however, can't find any way of installing it (pressing vol down + power). I also tried extracting the contents of the archive to the root of the SD card and rebooting (pressing vol down + power), however still can't find any way of installing this... Am I missing someth (HowTos)