James,
It is essential in overcoming any sins, especially those of the passions, to pray daily, and to pray unceasingly. Pray the psalter daily, at least one kathisma (about 9 psalms). Read the prescribed New Testament readings (Epistle and Gospel) and/or at least one chapter of one of the four Gospels daily, more if you can. Spend less time on the internet because that can be a source of temptation. Before you go to sleep, make the prostration while praying the Jesus Prayer. One priest called prostrations: "spiritual push-ups." Make as many prostrations as you can until you are too exhausted to stand, then you will sleep soundly with the Holy Name of Jesus on your lips. He will save you from your sins because with God nothing is impossible. However, you must persevere in prayer.
Not only is prayer essential, but also profitable spiritual reading is paramount. By reading good spiritual books, especially the New Testament, your heart, mind, and soul are nourished and protected from the Evil One, who "roams about the world like a roaring lion seeking whom he may devour" (St. Peter).
If you are not attending Sunday Divine Liturgies due to distance, etc., then by all means get a copy of St. Gregory Palamas: The Homilies, Mount Thabor Publishing, 2009. I obtained my copy at http://www.thaborian.com as it was more reasonable that Amazon.com. You will notice that St. Gregory, like St. Seraphim of Sarov, does not beat you over the head, but respectfully addresses his readers and pleads with them to increase their prayer and fasting, for only by prayer and fasting can one drive out the Evil One.
I just finished reading St. Gregory Palamas, "Homily 12: On the Fourth Sunday of Holy Lent: Being That of the Healing of the Boy with a Demon Including a Word on Attention to Inner Thoughts." This is a most excellent homily that is key for overcoming temptations and assaults from the Evil One. Notice the respectful tone especially in the first paragraph of his homily. This careful speech and behavior is often seen in saints especially after they have drawn closer to Christ. Indeed, St. Seraphim of Sarov used to address his penitents with "My joy, Christ is Risen."
I have spoken often to your charity about fasting and prayer, especially during these holy days. But so far I have imparted nothing to your devout ears and souls about the gifts with which they honour those who love them, and the many benefits they bring about for those who make use of them. These matters are confirmed above all by the Lord's words in today's Gospel reading. So what are these gifts? They are great, probably the greatest of all. Among other things, they can bestow authority against evil spirits, to cast them out and drive them away, and to free those possessed from their cruelty. When the disciples, referring to the deaf and dumb spirit, told the Lord that they could not cast him out, the Lord told them, "This kind goeth not out but by prayer and fasting: (Matt. 17:21) (paragraph 1, p. 87).
When your soul inwardly repulses the evil one's attack by means of prayer, attention, remembrance of death, godly sorrow and mourning, the body too, takes its share of holiness, having acquired freedom from evil actions (p. 91).
Reading the lives of the saints especially those of St. Seraphim of Sarov (a hieromonk) by Arch. Lazarus Moore and St. Nectarios of Aegina (a Greek Orthodox Bishop-monk) is also very beneficial.
Hope this helps,
Maria