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Turning the lamp off is the crucial first step in the process to ensure safety. This action prevents any risk of electric shock while handling the bulb, making it essential before proceeding with any further actions.

Turning the lamp on is an inappropriate step in this sequence, as it contradicts safety protocols. This step should only be performed after the new bulb has been installed, as having the lamp on while changing the bulb poses a serious risk of electric shock.

Screwing in the working bulb cannot occur until the broken bulb has been removed. This step is essential, but it must follow the unscrewing of the broken bulb to ensure a safe and effective replacement.

Unscrewing the broken bulb is the second step in the process, following the initial action of turning off the lamp. This step is necessary to prepare for the installation of the new bulb, but it cannot be done until the lamp is safely turned off.