The Mezzanine

Hee!

Not to be a butt or nothin', but it's really quite simple - you go to 'Organize', and then 'Import Content', and select the journal you want to import from, and what you want to import (tags, userpics, entries, comments, bio, friends groups, friends, etc.), then you start the import - and that's it. It might take awhile depending on how many other people are trying to import their journals, but you don't have to sit with it or anything - you can log out and forget about it and you'll find out when it's done when they message you about it.

But really, it's not like you have to decide now, anyways - you'll always be able to import it.