I truly believe that God would rather have you do something you believe He's telling you to do than to continue to make one excuse after another for doing nothing.
Trying is an act of faith. In trying, even if you make a mistake you can learn valuable lessons for your life that you can use and pass along to others. Being paralyzed by fear gets you nothing and nowhere. Wait a minute...isn't that the same thing you had in the same place you were this time last year?
Step out on FAITH. It's not brave if you're not scared. It's not faith if there is no reason for doubt. Faith is only activated in the dark. You may be receiving one confirmation after the other, but you still may feel uncertainty. Don't follow the feelings. That's not your faith. Follow the word of God and trust in what He continues to show and confirm to you. Let those things fuel your faith, and act beyond your feelings. If you continue to wait until you feel comfortable in your emotions before you act, you will probably never make a move. It may be that you won't feel good about it until after you're in it. But trust me, even then your emotions will continue to flip flop. This is why we walk by faith, not by sight, and certainly not by our feelings.