Install Remote desktop Quick Start dilemma

Trying to Install RDP on Windows 2012.

As Local Administrator:

1. Add Roles and Features
2. Remote Desktop Services Installation
3. Quick Start

Error= "You must be logged on as a domain user to access the Remote Desktop Services installation option."

As Domain Administrator

1. Add Roles and Features
2. Remote Desktop Services Installation
3. Quick Start
4. Session-based desktop deployment
5. Server Pool (default)

Error: Checking Compatibility

• Unable to connect to the server by using Windows PowerShell remoting
• The currently logged on user must be a member of the local Administrators group on the server.

The installer is supposed to be both a domain user and a local Administrator? Really? It can be done by GPO I guess but why isn't it documented?  What is the "recommended" technique for this and will this user need to be around for additional admin stuff in the future?

Note: Also added Windows Remote Management (HTTP in) on the RDS server, disabled firewall on both RDS and DC, did the:

• "Enable-PSRemoting –force"
• "Set-Item WSMan:\localhost\Shell\MaxMemoryPerShellMB 1000"

thingys. Needless to say, wasted a lot of time so far.

Any tips would be appreciated.

Thanks,

Bob.