When replacing a trimmer head, be sure to follow all instructions in the manual. Pay close attention to anything that requires measurement in order to avoid making mistakes.
Start by researching some of the best practices with regards to trimmer head replacement. Read online articles regarding the safety precautions to keep in mind. It is a good idea to have the instruction manual on hand. This will provide guidelines for each step. If the manual is lost, go online and request a digital manual from the trimmer head's manufacturer. Websites such as stihlusa.com provide free digital manuals as well.
Before starting any work on the equipment, be sure to turn it off. Unplug the device if it is connected to a power source. This will help prevent any accidents that may be caused by live electrical current. Clean the equipment to get rid of any debris that may have clogged it. This will ensure the equipment functions properly after the maintenance process.
Spread a drop cloth over the work area to prevent the floor from staining. This will also make cleaning much easier after maintenance. It is prudent to work in a well-ventilated area to allow proper circulation of air.