i did this and it was the most diffucult thing i ever did in my life. this vcharset is junk. i have a big db so in some tables the encoding process returned errors. i had to manually fix some ,
anyway i dont know how big is your db but u should check this out.
http://www.vbulletin.com/forum/showt...=1#post1816873
it will give u an idea on how to start, get a test forum and a dump and start testing importing etc. if any tables return errors try to exclude them from the dump, then encode the db with the excluded tables, and then if this happens i ll tell u what i did.