On October 2, the wall was complete. Nehemiah did what seemed impossible in only 52 days. But he faced mockery, conspiracy, and threats of physical attack along the way. Many today would take those things as being a closed door from God. Well, this isn't going very smoothly so this must not be God's will for me to do this.
Are you in the middle of something and having second thoughts as to whether you are in the will of God? Nehemiah left his palace life because he had compassion for other people. Compassion is often a starting point for obedience to God's will.
If you're having doubts, go back to your starting point. How did you begin going down the path that you're on? Was it a word from God or your own idea? Did you start with compassion, love, and faith? Or were your intentions more self-centered and a decision was made hastily? If the Holy Spirit was involved in your starting point, don't give up! You can do the impossible through faith despite the obstacles you face.