To hang curtains in a retail store or boutique, start by measuring the width and height of the window or area where you want to hang them. Next, choose curtain rods or tracks that match the desired style and size. Install the rods or tracks securely using appropriate hardware, ensuring they are level and aligned. Then, attach curtain hooks or rings to the curtains and hang them onto the rods or tracks. Adjust the curtains as needed for the desired length and appearance. Finally, make sure the curtains are properly secured and evenly distributed for a polished and professional look.