So many times it just feels like "if you don't have enough faith, don't pray hard enough, don't get really into the prayer and faith and trust, then nothing will happen and it will be your fault.
However I was reading Mike Evans "The Unanswered Prayers of Christ" where he felt drained of energy and could not see how he could pray with enough faith for the healing of a child. But he closed his eyes and prayed, thinking nothing will happen, I don't feel it, I am too tired to do it.
And someone told him to open his eyes and look. The child with the severe deformity was healed. Not because he had enough faith or enough time praying or anything ... but because God is the healer.
I must pray as an act of obedience. What God does with that is not my responsibility. I just pray "thy kingdom come, thy will be done" not "I will make your kingdom come and your will be done."
That is a great relief to leave it up to God.