The above technique is quite well known and you will be successful if you practice regularly.To stop, you may use breath . Breath slowly, deep and even. Even means time for inhalation and exhalation is equal. Practice slow breathing. to learn this, google,abdominal breathing. This will help you in many ways. Practice this breathing 10 minutes twice a day. With control on breath you can extend the time of intercourse as long as you like. Yes, you need practice of abdominal breathing.
You might try the stop-start method--when you feel like you are getting close to c***ing, stop all stimulation until the urge passes--hope this helps!