Here's a step-by-step guide on how to change a general E26 medium sized common light bulb:

  1. Turn off the power: Before you start, turn off the power to the fixture either by flipping the switch or turning off the circuit breaker. This will ensure your safety while changing the bulb.

  2. Remove the old bulb: Unscrew the old bulb by turning it counterclockwise until it comes out of the socket.

  3. Handle the new bulb with care: Hold the new bulb by the base and avoid touching the glass with your bare hands as oil from your skin can cause the bulb to burn out sooner.

  4. Install the new bulb: Place the base of the new bulb into the socket and gently screw it in by turning it clockwise. Do not over-tighten, as this may cause the bulb to break.

  5. Test the bulb: Turn the power back on and turn on the switch or circuit breaker to make sure the new bulb is working. If it's not, check the connections and make sure the bulb is properly installed.

  6. Replace the fixture cover: If your fixture has a cover, make sure to replace it to protect the bulb and wiring.

And that's it! Changing a common light bulb is a quick and easy process that can be done in just a few minutes. Just remember to always turn off the power before you start and handle the bulb with care to ensure a successful installation.