Turn off the power to the kitchen light fixture. Position a stepladder under the kitchen drop ceiling light panel.
Push the light panel up slightly with your fingertips, allowing the panel to rest on your fingertips instead of the drop ceiling grid.
Slide one-half of the light panel over the top of the adjacent ceiling panel. Tilt the light panel at a slight angle and pull it through the open grid under the light.
Pull until the entire light panel is out of the drop ceiling. It might be necessary to bow the light panel slightly to get it past the grid.