Mistake: Inaction
The man in Acts 14:7-10 had faith to be healed, but he was still crippled until Paul told him to get up. When the man added action to his faith, he was healed. Faith without works is dead (James 2:14-26). Real faith always proves itself through corresponding action.
Believing something without corresponding action is merely mental assent, which will not produce results.
The main “action” is saying with your mouth to yourself and others that you have received your healing. Saying anything else negates your prayer and ensures that you will receive nothing. The spirit of faith says, “I believe, therefore have I spoken” as Paul said in 2 Corinthians 4:13.