Determine what level of control the three-point hitch has. If the job to be done is simple, non-position control is sufficient, working in only the raise, neutral and lower settings. Otherwise, opt for position control and draft control. The former can operate at numerous degrees of lift while the latter will sense the burden on the tractor engine and make the necessary adjustment.
Confirm that the plow is hitched to the tractor's drawbar and that the drawbar is as low as it will go. Make sure the hitch pins are all inserted and stable.
Start the tractor and raise the hitch until you arrive at the section to be plowed. Keep the tractor and plow a safe distance from people.
Lower the attachment hydraulically and proceed with plowing. Listen closely to the engine if you do not have draft control. Check the depth of soil disturbance periodically and make hitch adjustments accordingly.