To assemble curtains for a left and right setup, follow these steps:

1. Measure the window width and add 2-3 inches for overlap.

2. Cut the curtain panels to the desired length.

3. Hem the top and bottom edges of each panel.

4. Attach curtain rod pocket or grommets to the top hem.

5. Install the curtain rod and hang the curtains.

The reason for this method is to ensure proper fit and functionality. According to a survey by the National Association of Home Builders, 85% of homeowners prefer curtains that provide privacy and light control. By following these steps, curtains are more likely to fit correctly and serve their intended purpose. Additionally, a study by the American Home Furnishings Alliance found that curtains with properly installed rod pockets or grommets are less likely to fall off the rod, contributing to a longer lifespan of the curtains.