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Cornice Installation Instructions
The tools required to install a cornice are a step ladder, steel tape measure and a screw driver (or screw gun).
Determine how high the top of the cornice will be above the top of the molding.  Using a helper have one person hold the cornice above the window while the other person stands back and views the placement from within the room.  Once the placement is determined make a small pencil mark on the wall marking the top of the cornice.
Measure the thickness of the top of the cornice.  This is usually 1/2" or 3/4".  From the mark on the wall make a second mark below it by the thickness of the top of the cornice.  This is where the top of the angle irons will be located.  From this second mark measure to the top of the molding.
Locate the studs above the window.  By tapping your finger or knuckle across the top of the window you will be able to hear a difference in the tapping sound when you tap over a stud.  (If there is no difference in the tapping sound across the top of the window that means there is one single piece of wood spanning the top of the window.  This is common and you can place the angle irons any where across the top of the window.)  Usually there are studs that line up with the outside edges of the window.  You cornice most likely is a 2" wider than the window molding.  These outer wall studs are usually under the molding next to the window.  Use these two studs to attach your angle irons.
Align the top of the angle iron with the second mark you made on the wall.  Use the 2 1/2" long wood screws provided with you mounting hardware to attach the angle irons to the wall.  Attach both angle irons at the same height above the molding.
Now place the cornice on the two angle irons.  Have a help stand back and view the cornice from within the room.  Center the cornice over the window.  Reach under the cornice and add a the remain 2 screws in each angle bracket.  These screws will be either 1/2" or 3/4" in length. Depending on the thickness of the top of your cornice select the appropriate length so the screws will not protrude through the top of the cornice.