More self control - Beginners Most of the time we are under control of our mind and old habits.If a beginner wants to break the old habits and get more control of it.From where do they should start ?
One starts by seeing with insight how the old habits are disadvantageous, unsatisfactory (incapable of bring lasting hapiness), dangerous, harmful &amp;/or promote suffering. 

One starts by seeing with insight the advantage &amp; benefit of giving up those old habits. 

The Dvedhāvitakka Sutta is one of many suttas describing how the Buddha, before his enlightenment, reflected upon the advantages &amp; disadvantages of differing types of thinking.

The Upanisa Sutta states a cause of faith in Buddhist practises is the experience of suffering.