1. Say Them Out Loud. Just read the Psalms slowly and thoughtfully, assenting to what they say with as much understanding as you have, intellectually and emotionally. Don't just read them, pray them; say them from the heart. The Psalms contain both the Word God has to say to us about prayer and the words he wants us to say to him in prayer. "This is pure grace," exclaimed Dietrich Bonhoeffer, "that God tells us how we can speak with him and have fellowship with him."
2. Festoon Them. Think of a psalm as a Christmas tree. Read it and then festoon it with your own prayers, as you would decorate a tree. Your prayers are answers to what God says to you in the psalm. One way to understand a psalm's intent is to read it through the lens of the "three Rs": Rejoice: What do I find here that gives me cause to rejoice, to give praise and thanks? Repent: What do I read here that brings to light sin in my life? Request: What in this psalm can inform the way I pray for others and myself?
3. Paraphrase Them. Meditate on and study a psalm until you understand it well enough to put it into your own words. Then paraphrase the psalm as you have come to understand it, and pray your paraphrase. No one need read or hear what you have written but you and the Lord, who delights in the prayers of his people.
4. Learn Them by Heart. Memorize the Psalms—but not by rote. Rather, learn them by heart; make their words your words. Come to understand them so well you can recite them—by inflection and tone—as though you had written them yourself. This is by far the best way I know to learn to pray the Psalms. I can think of no more powerful way to allow the Word of God to change who you are and how you think. Over the years, the prayers ...