The power and the ability to properly document the infrastructure is, for sure, half-way to understand and spot problems.

 With this in mind we have released some simple yet very useful Install Guide Templates for Exchange Server 2010.

Templates are provided for the Client Access, Hub Transport, and Mailbox server roles, plus a template for the Mailbox role configured for a database availability group.

Available for download at: 

Microsoft Exchange Server 2010 Install Guide Templates
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=5f9dbd88-dadf-4ad9-9f28-ad35a1ab1da2