How do I properly perform a crank arm replacement on a bicycle?

To properly perform a crank arm replacement on a bicycle, follow these steps:

1. Remove the old crank arm by loosening the crank bolt with a crank puller tool.
2. Take note of the orientation of the old crank arm before removing it.
3. Install the new crank arm by aligning it with the bottom bracket spindle and tightening the crank bolt securely.
4. Make sure the crank arm is properly aligned and tightened before riding the bike.

It is recommended to consult a professional or refer to the bicycle's manual for specific instructions.