In-Place DC Upgradation from Server 2003R2 Standard to 2008 Enterprise

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http://serverfault.com – We have a Domain controller in server 2008 Enterprise and Additional DC in server 2003 R2. Now I need to upgrade Additional Domain controller to Server 2008 Enterprise and raise the domain functional level to 2008. The DC is running with Active Directory, DNS and DHCP. The server is installed in VMware ESXi 4.0. Please guide me to carry out the upgradation. Also I want to know about the possible risk of in-place upgradation, if any. Regards, Tony (HowTos)