/beta copies your toon from FG to beta. Close game then on launcher change the region from US to Beta.
I would suggest you setup a 2nd client for this, because for some reason you gotta download 20 gigabytes...
No you don't, shut the game down, go to your EQ2 folder, copy all files and folders, and paste into the Beta folder. Once copied, run the patcher for Beta, should only have about 106 megs to update after that process.