How do you replace a dead light bulbs?

If you have a hard time getting a grip on the bulb to unscrew it, then try wearing dishwashing gloves.

going to the auto part store

Most LED lights are not replaceable. The best thing to do would be to buy the bulbs and the strings separate

Turn off the power. Grasp the bulb with a cloth. Unscrew (screw-in fitting) or push and turn (bayonet fitting) anti-clockwise to remove. Take the new bulb, using the cloth. Do not touch the glass...

First turn off the power at the switch. Take a potato and place it over the socket of the bulb, while pushing down unscrew the bulb base to the left counter clockwise. Hope this helps, I do this...