Just promote it! There shouldn't be any problems at all.
The only thing to think about is that if users only have home directories on current PDC and not on the BDC they won't be available to the users anymore.
Since their new PDC don't have their home directories.
In addition to the previous answer, If you do not use replication, make sure that logon scripts are copied, mapped drives on PC's reflect the new PDC and roaming and mandatory profiles are also available. Then its a case or looking at what the current PDC supports and making sure its available elsewhere (Dial in, Internet/Intranet etc.) ~Tony
Also, if you run any other services (DHCP, WINS, RAS...) on the current PDC you will have to set them up on another server. I would move all of these services one at a time before I take the old PDC offline. Generally, promoting a BDC will not affect most services, just taking the service provider offline.
Also, if you run any other services (DHCP, WINS, RAS...) on the current PDC you will have to set them up on another server. I would move all of these services one at a time before I take the old PDC offline. Generally, promoting a BDC will not affect most services, just taking the service provider offline.
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Promoting BDC to PDC in NT 4.0