First thing about thinking is that you should never be afraid. Fear erodes all creative effort. Certainly, you are not going to always get it right. Actually, you are never going to get it completely right. So calm down. Breathe. Let your thoughts come to you. You will learn how to make them ordered and aligned in time. But first, release your mind from fear. Otherwise it will stop you every single time; and thought does not want to stop. It wants to fly!