Begin by accessing the drain opening. For strainer-type covers, carefully unscrew the center screw using a screwdriver. If you see hair or debris, remove it with your hands or pliers. For other cover types, consult your drain's instructions or a relevant YouTube video for removal.

Create a tight seal with a cup plunger over the drain opening, ensuring enough water covers the cup. Vigorously plunge up and down for several minutes to dislodge the clog. Afterward, check the shower for water flow improvement.

If plunging fails, utilize a drain snake (plumber's snake) to reach and break up or retrieve the obstruction. Insert the snake, rotating it as you feed it down the drain. Carefully remove the snake, cleaning off any debris. Flush the drain with water to test its functionality.