Final answer:
Ensure the tool is powered off and unplugged, wear safety equipment like gloves and goggles, and then replace the tool's parts following safety procedures.
Step-by-step explanation:
Before replacing parts such as bits, blades, or discs on any tool, you must ensure that the tool is powered off and unplugged to prevent any accidental startup during the replacement process. It is also critical to wear appropriate safety equipment like gloves and goggles to protect yourself from potential harm. Once the tool is safely powered off and you're properly equipped with safety gear, you can proceed with replacing the necessary parts following the manufacturer's instructions. Always remember to handle sharp components with care to avoid injury.