Check your local city and county ordinances to make sure that it is legal to burn thatch there. Note special restrictions on thatch burning, as some ordinances legalize it only at certain times, such as in the evening. Obtain any necessary permits.
Inform your neighbors of your intentions in order to prevent unnecessary calls to the fire department. Protect their property by liberally wetting the grass, fence or anything that separates the property line between your yard and theirs to create firebreaks.
Don your flame resistant clothing, covering as much skin as possible. Put on the mask to prevent smoke and soot inhalation. Wear flame resistant gloves. Carry the fire extinguisher during the entire burning process as a backup plan to swiftly extinguish any wayward flames.
Ignite the thatch at the corner furthest from your home or any flammable objects. Watch the fire carefully, noting which way the grass burns.
Continue to burn the thatch, watching closely to make sure the fire is burning steadily and in the direction you desire. Spray the hose over areas that have already burned to put out any hidden flames.
Once you have successfully burned away all the thatch, douse the entire lawn with a hose as a safety precaution. Rake the lawn, if desired, to spread the ashes around.