samba - Jan 2004 - Converting local unix users to winbindd

I've got a samba server with about 800 users that is part of a NT domain,
and is set to security=server (pointing to a PDC for auth).  The samba server
was setup years ago before winbindd.  I'd like to convert all the local unix
users(all of which are really domain users) to use winbindd.  Does anyone know
of a document that describes the necessary steps to do this(ie - changing file
permissions to the winbindd uid/gid, mapping unix groups to winbindd domain
groups?  Did a little googling, but didn't turn up anything of value.

Thanks for any help.

Tom