I have found (at least for me) that habitual faults generally happen as a result of 2 things: Lack of awareness and lack of control.
In order to be more aware and reminded of what particular fault I am working most to overcome, I always outwardly wear a crucifix, Saint Benedict Medal, miraculous medal, and/or other medals of saints. I always wear a scapular, and recently have taken to wearing a wrist/chain symbolizing the Consecration to Jesus through Mary.
Once I am more aware of what I am doing when I am doing it, the next step is to gain control. This can only be achieved, first of all through prayer and the grace of God, but then also very importantly is penance.
Physical, mental, and spiritual mortification...
These three things are greatly lacking in our society, and hence the reason why we all fall so much more easily into habitual sins.
Here are a couple quote on mortification and its necessity explained more depth:
Taken from the Most Reverend Father Faber's book (whom I personally believe to be a saint), Growth in Holiness:
“The true idea of mortification is that it is the love of Jesus, urged into that shape in imitation of Him, partly to express its own vehemence, and partly to secure, by an instinct of self-preservation, its own preservation. There can be no true or enduring love without it, for a certain amount of it is requisite in order to avoid sin and keep the commandments. Neither without it is there any respectable perseverance in the spiritual life. The rest which forms part of the normal state of the spiritual life is not safe without it because of the propension of nature to seek repose in natural ways when supernatural are no longer open to it. Mortification is both interior and exterior; and of course the superior excellence of the interior is beyond question. But if there is one doctrine more important than another on this subject, it is that there can be no interior mortification without exterior; and this last must come first. In a word, to become spiritual, bodily mortification is indispensable.”
After this he went on to speak of its application in our present day and age:
“Indeed modern luxury and effeminacy, which are often pleaded as arguments for an abatement of mortification, may just as well be called forward to maintain the opposite view. For if it be a special view of the Church to bear witness against the world, her witness must especially be borne against the reigning vices of the world; and therefore in these days, against effeminacy, the worship of comfort and the extravagances of luxury. I believe that if this unhappy land is ever to be converted, of which there are many hopes and no signs, it will be by some religious order or orders who shall exhibit to a degraded and vicious people the vision of evangelical poverty in its sternest perfection... If the Church has to witness always against the reigning vices of the world, each soul has likewise, if not to witness, at least to defend itself against them. And how shall it defend itself against the worship of bodily comforts except by depriving itself of them?”