It isn't really "error handling" because there isn't any error. There are
two ways to determine whether the requested text was found in the document.

(1) The property Selection.Find.Found or myRange.Find.Found will be True if
the requested text was found, and False if not.

(2) The Selection.Find.Execute or myRange.Find.Execute method returns a
boolean value that is the same as the .Found property.

Here are two code snippets to show how these are used. The "Else" clause is
often omitted because we don't want to do anything if the text wasn't found.

Sub foo1()
   Selection.HomeKey wdStory
   With Selection.Find
       .Text = "hello"
       .Execute
       If .Found Then
           Selection.Font.Bold = True
       Else
           MsgBox .Text & " was not found"
       End If
   End With
End Sub

Sub foo2()
   Selection.HomeKey wdStory
   With Selection.Find
       .Text = "fox"
       If .Execute Then
           Selection.Font.Bold = True
       Else
           MsgBox .Text & " was not found"
       End If
   End With
End Sub