Configuring a Certificate for Virtual Machine Connection in Hyper-V or thru SCVMM internally. to migrate host away from one of the Hyper-V machines and then perform the actions above. Once he has successfully validated it then he can perform the changes on each HV host in the same manner.
A change request needs to be raised but the impact is minimal as the HV cluster is designed for such live maintenance. He put the HV host in maintenance mode before performing the blog.