God gives room for His children to learn, explore and make mistakes as they do His work. In Him, there is courage to keep trying and not let failures intimidate us into passivity. In Christ we have a most valuable gift: the permission to fail.
Where His Spirit is, there is freedom - freedom to make mistakes, freedom to dream big wild dreams, freedom to fail, and freedom to pick ourselves up and keep going. Don't let (the fear of) disappointment steal your courage; God is on your side and He will come through for you. He's got you, you can do this.
"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat." - Theodore Roosevelt