“How do you act when you are afraid?”
I honestly try my best to remember that God is always with me, so I need to have faith, not fear. I also remind myself of the times I did step out in faith when I was doing something that was, at the time, new and scary, and how much God blessed me in those times where I went ahead and followed His lead, despite my apprehensions. Keeping these at the forefront of my mind really helps me not to stay in a state of fear, but to have godly boldness.
See: 2 Timothy 1:7, Proverbs 28:1, Psalm 56:3, Luke 1:30 & Luke 2:10, Acts 27:24, Matthew 10:26 & Matthew 28:5, and many more verses on not having fear.