Regs: if you're impatient, and can't handle the cable trick, you can always try this at your own risk: http://windowsphonehacker.com/articles/want_windows_phone_7.8_now_try_this_easy_tool-01-31-13
according to the website:This tool will install the official, RTM Windows Phone 7.8 update today, right now. It's easy. Just click Install 7.8, then select the desired language packages. Then wait.
I had trouble at first with the "disconnect internet" trick, but found it was an issue with the internet connection i was using (may have been a timeing issue with the connection to the servers etc)
When i tried again at home, i was able to get it to allow the update three times (as there were three updates) by waiting for 6 seconds prior to disconnecting the wireless on my laptop. Also i had the phone in flight mode.
Loving the extra accent colours, and the smaller live tiles. i am also enjoying feeling like the screen is much bigger due to the black bars down the side being now more fully used.