Take a square piece of paper or cardboard and cut out a corner to match the corner of the window. Decide the height you want the curtain to be mounted above the window and mark the cardboard. Make holes where you’ve marked. Place the cardboard on the wall and mark through the holes, onto the actual wall. Do this for both sides. Use a command hook with a heavy load capacity. Place the
command hook and wall mount onto the wall lining them up with the marks
you’ve made. Wait 30 minutes for the command hook to become secure and hang your curtains.