Start by reading and meditating on 2 Corinthians 7:10.
You will never be done with repentance – at least, not until death or Christ’s return. While it is something you should be doing frequently, it is not something you just ‘get used to.’ Repentance requires a daily intentionality. And let’s be honest; you will have more to repent of by the end of the day than you can possibly remember. So, where should you start?
…It will be helpful to think of repentance in three parts: revulsion, resolution, and repetition. Revulsion is finding something offensive or distasteful. In this case, it is seeing the heinousness of sin and pulling back from it. Sin, your sin in particular, should make you recoil. …Revulsion will come only when you see the holy, just, and good character of God in contrast to yourself. Until you understand that your sin, all of it, is a self-destructive rebellion against God that betrays your purpose and denies his worthiness, you will not experience revulsion.
Resolution is purposing to walk in righteousness, delighting in God’s law, laying off the old self, and walking in newness of life. Repentance is more than feeling sorry for what you are and have done. It is having the resolve to live for the glory and pleasure of God.
Repetition is the ongoing nature of this work. Without repetition, it is all for nothing, for as long as you continue to sin, you need to repent.If your repentance is not continual, it means, at the very least, that you are simply choosing some sins to deal with, while ignoring others.
…The deepness and consistency of your repenting will have a direct impact on the liveliness of your faith and the brightness of your confidence. This is not because you repent so well, but because in repenting you know the darkness and trouble of your own sin, and the great work of grace in Jesus that overcomes it all.
Taken from Chap.30 “Repent” (found in Part Three, “The Gospel and You”) in Note to Self: The Discipline of Preaching to Yourself by Joe Thorn (Crossway, 2011), pp. 99-100.