How can I replace a refrigerator water line efficiently and safely?

To replace a refrigerator water line efficiently and safely, first turn off the water supply and unplug the refrigerator. Remove the old water line carefully, then measure and cut the new line to the correct length. Connect the new line securely to the refrigerator and water supply, making sure there are no leaks. Finally, turn the water supply back on and plug in the refrigerator to test the new water line.