I am trying to overcome this issue for last 3 years. It is very difficult to quit it but I have realized I get urges to watch porn when I am alone in my room or when I am stressed (or both) so I try not to be in my room alone anymore. I leave the room as soon as I get an urge to what it. When I am stressed then I read an article or a book to divert my mind.

In the end it all really depends how badly you want to quit it and how motivated are you to really quit it. Believe me, I know that it is really difficult. I am trying to quit many addictions (porn, fa,cigarette,coffe and alcohol) by May end.