James instructs us that when we make a request to God in prayer, we must do so confident in God's ability to deliver. If your prayer is not done in faith and you have any doubt then you will have no confidence in your prayer.
Prayer without faith and confidence in God's ability to deliver is ineffective. Spend time developing faith based on God's Word. Then you will have confidence in God's ability to deliver.
Remain in confidence during and after you pray. Once you have prayed, believe you have received it. The physical manifestation is just around the corner.