Select the appropriate curtain rod kit for the project. You'll need a double rod so you can hang the sheers and curtains together. Use decorative rods when you want the rod to show as part of the overall look. Use traverse rods for curtains that are opened and closed from a stick that hangs down. Use concealed rods when you don't want the rod visible.
Measure the length of your curtains. Decide where you want the bottom of the curtain to hang. Measure from the bottom measurement up the length of the curtain so you know how high it will go up the window. This is where you want your curtain rod to go.
Align the rod brackets on the upper edges of the windows so the rod will hang at the previously measured height. Ensure that the brackets are far enough apart that the curtains have room to sit on either side of the window when completely open. This is usually about 1 to 2 feet on either side of the window.
Screw the brackets into the wall using the screws appropriate for the wall material. For example, use drywall screws in drywall. Ensure they are securely in place.
Slide the sheers onto the bracket closest to the wall and secure both ends in place. Repeat for the curtains on the outer rod.