Changing Standalone Server to PDC

I am trying to do some testing on an isolated NT network with one NT 4.0 server and six NT 4.0 work stations. The network was setup using the Workgroup Model instead of the Domain Model.

My problem is I need to conduct my tests on an NT networkusing the Domain Model.

Can I easily convert a Stand Alone server to a Primary Domain Controller or do I need to re-install NT server?

Also, in either case, is there anything I should worry about on the clients?

Any help would be appreciated.