It's easy as pie if you've done a nandroid backup and or use titanium backup but I ( heh..heh) never do anything the easy way...
Because I roll pretty light even the long way took me only 30 mins to get everything back the way I like it even with a full data wipe ( which is totally unnecessary except for people like me who like to declutter every once in awhile) .
Wipe data (optional) , wipe cache, wipe dalvik, install alpha 2 .zip, wipe cache's again (for the truly anal) , reboot, reinstall apps and themes.
I only use a handful of apps so this takes no time at all ( opera mobile, ezpdf, aldiko, mobo player)