While resizing of a disk in a virtual machine may be easy, booting to an ISO cd might sound trivial but if you've never done it before you might be scratching your head like i was. Turns out when connecting via the VirtualCenter, on boot there are things fired off that have to do with HA and DRS that make the gui pause a bit and not show the inital step of the VMWare bios boot screen. If you connect directly to the ESX server with the gui, it doesn't do this and you can get into bios very easily. That one threw me for a loop for sure.