How to run Hyper-V on a VM in Hyper-V

If you try to install Hyper-V role on a VM in Hyper-V, you will get an error message mentioning that, "Hyper-V cannot be installed : A hypervisor is already running". Follow the steps given in this blog to get it installed using PowerShell commands.

Note:
It is NOT recommended in a production environment. Use this only for self study and testing in labs.