Stage one macro might work along these lines
Code:
Sub DamnBrackets()
Dim aPar As Paragraph, aRng As Range
For Each aPar In ActiveDocument.Paragraphs
If aPar.Style = "Normal" Then
Set aRng = aPar.Range
Do While Left(aRng.Text, 1) = " "
aRng.MoveStart Unit:=wdCharacter, Count:=1
Loop
Do While Right(aRng.Text, 1) = vbCr Or Right(aRng.Text, 1) = " "
aRng.MoveEnd Unit:=wdCharacter, Count:=-1
Loop
If Len(aRng.Text) > 0 Then
aRng.InsertAfter ")"
aRng.InsertBefore "("
End If
End If
Next aPar
End Sub
To reverse it the simplest thing to do would be to find and replace those characters with nothing. If you need to identify which ones were inserted by the first macro then it becomes a lot harder unless you tagged them in some way as you insert them. Can you use brackets that don't appear elsewhere in the text?