If you are always scared to take the leap forward then you will remain frozen in your place, feet unmoving. It is common to feel scared, worried, or anxious but at some point you are going to need to put those worries aside and just do what is necessary. No one in life is truly prepared because life can throw anything at us but the best we can do is to just keep on going. Whatever challenges we may face, just keep going. Taking the risk will not kill you but not taking the risk might. Even if things do not go the way you plan it to, at least you could say that you tried your best and you did everything you could. You would not have regrets in life and would live the rest of your life proud and satisfied.
The problem with most of us is that we are always satisfied with what we have achieved and want to remain in our comfort zone. The comfort zone is the burial ground of champions while challenges give birth to champions. I used to be scared of taking risks but I discovered that even failure is an experience that could help to shape our future. If you are scared of making mistakes then you will never learn and the failure to learn will lead to stagnation and underdevelopment.