What are the steps to install a drop ceiling grid in a room?

To install a drop ceiling grid in a room, first measure and mark the ceiling for the grid placement. Then, install the wall angle brackets around the perimeter of the room. Next, hang the main tees from the ceiling using wires and secure them to the wall angles. Install the cross tees between the main tees to create the grid pattern. Finally, insert the ceiling tiles into the grid and make any necessary adjustments for a finished look.