Hi there ,
For a person having any disorders , first step is to accept that he is suffering from a disorder.Yes these disorders are treatable by psychological and non psychological means.
Next Steps
Avoid doing the acts which you don’t want to do.
Avoid the “cues” that generate the cravings to do the acts and reduce the urge to do it again and again.
These acts are likely to increase the distress.
Learn Relaxation exercises.
Go for Yoga exercises and meditation.
But yes, in addition to above, you have to take the help from a mental health professional for the problems.
Detailed medical and psychological history is taken and psychological interventions are also needed.
Health Tips
Some of the drugs are recommended for the above kind of disorders but these are to be taken under the supervision of a mental health professional.