Dunno if you have managed by now, but it is a simple process, i did it in a matter of about 10 minutes - and thats because the Nokia Updater is so slow!
I wouldnt recommend it though. I thoroughly regret doing it, only because i hate the font, and dont like the new music button instead of the nice animated shortcut menu.
If there was a way to go back to the original version now, i would. Been trying to change to the IE edition, but i cant seem to do it.