Can you give me a little more insight on how to set this up?

Sadly, I'm a complete noob when it comes to VBA in Word.  I do program
extensively in Access, but I've never had a reason to learn about adding
modules to Word documents so I don't know how to get it started.

I basically understand what the code from your link is doing, I just don't
know how to call it when the document opens.  I added the chunk of code from
the end of the web page to its own module for the document I'm working on,
then I added the following to the code under 'ThisDocument':

'====================================
Option Explicit

private iDuplex As Long

Sub SetDuplexOnOpen()
   iDuplex = GetDuplex    'save the current setting
   SetDuplex 3                'set for vertical binding
End Sub

Sub ResetDuplexOnClose()
   SetDuplex iDuplex        'restore the original setting
End Sub
'====================================

How would I have SetDuplexOnOpen() run automatically when the document opens
and run ResetDuplexOnClose() when the document is closing.  I'm thinking
along the lines of the Form_Open and Form_Close subs from Access which always
fire, so maybe I'm approaching this incorrectly, but I don't want to rely on
any user interactions to change the printer settings.

Thanks again.