How do you replace a starter on a 2004 BMW 545i?

To replace the starter on a 2004 BMW 545i, first disconnect the negative battery terminal to ensure safety. Remove the engine under cover and any necessary components obstructing access to the starter, including the intake manifold if needed. Unbolt the starter from its mounting position, disconnect the electrical connections, and install the new starter by reversing the removal steps. Finally, reconnect the battery and test the new starter to ensure proper functionality.