Position the weed eater on the ground and hold it firmly as close to the ground as possible, but never go beyond three inches off the surface. Start the machine and use one hand to handle the trigger, and the other hand on the handle. Warm up the weed eater by holding the throttle for thirty seconds up to one minute. Keep the weed eater at waist-level, with the attachment positioned parallel to the earth. As you cut the weeds and grass, move the head of the device in a back-and-forth motion, and side to side movement. This process does not only provide even cutting, but this movement also reduces the debris flying off from the ground to your body.
Note: Remember that for the gas-powered weed eater, you need to press the primal bulb a couple of times for the gas to flow directly to the carburetor. For the electric-powered weed eater, simply press the trigger. And for the battery-operated weed eater, turn on the switch.