Jesus said "Therefore I say to you, all things for which you pray and ask, believe that you have received them, and they will be granted you." [Mark 11:24]
How exactly do you do that? By using your God-given gift of imagination...the eyes of your heart!
2 Corinthians 4:18 tells us to look at the unseen, so we must be able to. Since we know that all things already belong to us [1 Corinthians 3:22,23; 1 Timothy 6:17] and all the promises of God are 'yes' in Him [2 Corinthians 1:20] we can have confidence in prayer. We can ask, in faith, believing we receive. See it as already accomplished, feel the joy of answered prayer--Jesus said that the purpose of answered prayer is that our joy might be made full! [John 15:7-11]
See the prayer answered, feel the prayer answered--believe you receive--then speak the prayer answered. Give thanks, out loud, for the spoken word becomes physical reality. [See previous posts, Words Create and Yad]
An excellent book on this topic is Dewey Friedel's Imagine That, which explores the power of the sanctified imagination from a biblical point of view, with a healthy dose of quantum physics and real-world examples. I would recommend it as a must-read.