If you don't want to inactivate your old NetInfo DB, you could try this:
Just delete this:
/private/var/db/.AppleSetupDone
If you delete this file, OS X will "think" you haven't done the setup, and will launch it again for you.
This could come in handy if you don't want to remove your account (like a system admin-account), but want to force a new user to create his/her own account, after a first boot.