SBS 2011 Migration: Cannot demote old SBS 2008 server

Experts,

I am on the process of migrationg from SBS 2008 to SBS 2011. I've been following Microsoft's instructions in the document "Migrate to Windows SBS 2011 Standard from Windows SBS 2008" and I've reached the point where I am to demote the old SBS 2008 server.

I run DCPROMO, making sure NOT to check the boxes "Delete the domain because this server is the last domain controller in the domain" and "Delete the DNS delegations pointing to this server".

When the wizard is to perform the demotion, it stops with the error

The operation failed because:

Active Directory Domain Services could not transfer the remaining data in directory partition DC=ForestDnsZones,DC=MyDomain,DC=local to
Active Directory Domain Controller \\NewSBSServer.MyDomain.local.

"The directory service was unable to transfer ownership of one or more floating single-master operation roles to other servers."

I've read articles referring to the NTDSUTIL command and using that to transfer the FSMO roles manually, but I am a bit worried about doing this on a Small Business Server.

Any advice? Should I run dcpromo /forceremoval?

Thanks!