Bookmark the actual address area with some cushion spaces. A macrobutton
field with field codes displayed (Alt-F9) will look something like:

{ MacroButton NoMacro [Name] }

When field codes are hidden, it looks like:

[Name]

I usually format the prompt language to be blue or red text (but not the
entire field). That way it stands out as unfinished when you haven't typed
in all the fields.

When you click on it, the entire thing is selected. Typing replaces the
selection. You can move to the next one with the F11 key. Some macros to do
this are below. See http://addbalance.com/usersguide/fields.htm#MacroButton 
for more on using macrobutton fields.

For the moment, assume that the brackets are bookmark delimiters. My
template's envelope address looks like:

Name
Street [
City ST  01234   ]

Moving among the macrobutton fields and replacing them does not mess up the
bookmark because of the cushioning spaces. The BarCode field uses the
bookmark.

The following subroutine selects a particular field. It is called by another
macro with the information about the field number. For instance, the
following command in a macro will go to the third field in the document body
(regardless of field type).

SelectIt(3)

Sub SelectIt(iField As Integer)
'   Routine goes to beginning of document and then goes to field
'   iField sets number of field to go to
'   written by Charles Kenyon
'
   Dim iNumber As Integer
   Selection.HomeKey Unit:=wdStory
   For iNumber = 1 To iField
       Selection.NextField.Select
   Next iNumber
End Sub

Otherwise, the following statement selects the next field in the document,
like pressing the F11 key:

Selection.NextField.Select

Hope this helps clarify.