The answer to 'how to replace circuit breaker' is that you can replace a circuit breaker yourself if you feel comfortable working with electrical systems, but it's important to take safety precautions and follow proper procedures. Circuit breakers are essential for protecting your home's electrical system, so it's important to replace them correctly.
Before starting, make sure to turn off the main power to the circuit you'll be working on. Then, use a voltage tester to confirm the power is off. Carefully remove the old circuit breaker and install the new one, making sure all connections are secure. Finally, turn the power back on and test the new circuit breaker to ensure it's working properly.