What is the first step to take when using a fire extinguisher?

The appropriate first step when using a fire extinguisher is to pull the pin. This action is crucial as it unlocks the operating mechanism of the extinguisher, allowing for the subsequent use of the device. The pin is a safety feature designed to prevent accidental discharge, and removing it enables the user to properly engage the extinguisher.

Once the pin is pulled, the user can then move on to aiming at the base of the fire, squeezing the handle, and directing the nozzle. Each of these actions is important in effectively using a fire extinguisher, but they must occur in the correct sequence, which begins with pulling the pin. Understanding the proper order of these steps is critical for effective fire suppression and safety.