The only real progress you can make comes from uncertainty, from facing your fears and moving on despite of them.
If you are uncertain, it just means that you’re in the right place, that you’ve stepped outside of your comfort zone, that you’re learning and growing.
You will be uncomfortable, and you should be uncomfortable. It’s a clear sign that you’re improving. Embrace it. Much better than living the life of certainty, fear, and meaninglessness.