After running through a few installs, I have come up with a simple list of suggestions to help streamline the process and eliminate a little of the headache. For reference, these are the official steps to follow from MS for PU12 can be found here.

Install Azure Powershell Extentions On Template (also, use a template)

When creating the on-premise connector or creating an environment to deploy, want to know where to source all of the values you are being asked for? There are some scripts to help.

Creating The On-premises Connector

Included with the scripts to setup the service fabric cluster is this one:

.\Get-AgentConfiguration.ps1 -ConfigurationFile .\ConfigTemplate.xml

This gives a nice table of output with almost everything you need to create the on-premise connector.

What should you do if you encounter this error when setting up an on-prem instance?

New-AzureRmADSpCredential : Update to existing credential with KeyId ΓÇÿxxxΓÇÖ is not allowed. At Add-CertToServicePrincipal.ps1:62 char:1

+ New-AzureRmADSpCredential -ObjectId $servicePrincipal.Id -CertValue $ ...

+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

+ CategoryInfo : InvalidOperation: (:) [New-AzureRmADSpCredential], Exception + FullyQualifiedErrorId : Microsoft.Azure.Commands.ActiveDirectory.NewAzureADSpCredentialCommand 

Let's work in replacing financial dimensions between a source and target

Configuring a relay SMTP server for some of the AX email functions can be tricky if it's your first time doing something like that.

Let's try to catch some field updates using event handlers

 Repairing SQLDictionary can be a pain when it gets corrupt for any reason. Let's cover how to break it but also fix it.

What to do if you encounter "Could not load file or assembly 'Microsoft.TeamFoundation.Client, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified."

I was recently installing AX 2012 R3 CU12 on a development VM and ran into an issue installing the SSAS extention.