What I m trying to do is use a command button on an Access form to:
Open a Word document.  
Automatically populate text form fields in the Word document using fields from the current Access form.  
And then print the populated Word document.
The Word document should automatically print on both sides of the paper.
I ve wasted several reams of paper, pulled out all but a few strands of my remaining hair, and quite possibly gone insane.  I m a beginner at VBA so if anyone tries to help restore my sanity, I d appreciate any additional explanations.  That said, this is what I have so far:

Private Sub DeliverySheetPrint_Click()
 Dim appWord As Word.Application
 Dim doc As Word.Document
 'Avoid error 429, when Word isn't open.
 On Error Resume Next
 Err.Clear
 'Set appWord object variable to running instance of Word.
 Set appWord = GetObject(, "Word.Application")
 If Err.Number <> 0 Then
  'If Word isn't open, create a new instance of Word.
  Set appWord = New Word.Application
  End If
 Set doc = appWord.Documents.Open("C:\Users\eric.m\Desktop\QA Form 17 latest.docx", , True)
  With doc
   .FormFields("txtCWP").Result = Me.CWP
   .FormFields("txtFullTask").Result = Me.FullTask
   .FormFields("txtJCN").Result = Me.UIC & "-" & Me.JSN
   .Visible = True
   .Activate
   End With
   appWord.PrintPreview
  Set doc = Nothing
  Set appWord = Nothing
End If
Exit Sub
errHandler:
MsgBox Err.Number & ": " & Err.Description
End Sub

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Reply from Alex Hedley:

What isn't it doing? Are the fields not being populated?
You have a PrintPreview command, is it trying to print also?