This is the perfect time to start, right now, not later, not tomorrow.
You have the idea now, you are scared now and being in fear is a signal to start something great. You can't wait for the fear to disappear before you start. The journey will always become scary, it is what it is. You can't change it nor manipulate it. Comfort is for spoiled people who thinks that they are rich and blessed.
Even if you feel so heavy, even if there is a mental wobbling going inside of your head, just start!
It doesn't matter if it is 3 am in the morning, you are awake, you think of an idea, you feel that it will work somehow, so what are you waiting for? get up, do what you can do and push until you can push.
It doesn't matter if you don't have enough money now, time is all that matters. It is running out, so what are you waiting for? just start. Leave what you must leave, never mind if your wife will be mad at you, never mind if your parents will forget you. Once the idea on your mind is always visiting you every now and then... then that is the perfect time to start.
No matter what your circumstance is, no matter how you feel or how much is at stake if you start... just start.
Because tomorrow your ideas maybe gone, tomorrow your fear might eat you and freeze you forever. Tomorrow the situation will be even worse, it will be more difficult for you to start.
There is a story of a man who always prepare himself for a challenge, he trains himself, he studies a lot. He wanted to make sure that he is ready before he start, years have passed and fear ate him. he wasn't able to start because the more he prepare, the more his fear becomes bigger. See, even if you are so prepared you will still become scared.
Start now even if you think your knowledge is not enough, don't worry because you will gain a lot of information as you travel your journey. Don't think that you are not ready because no one is ready in this world. The only difference is... successful people doesn't mind if they are ready or not, they just throw themselves into the challenge. They adapt and improvise, they conquer and rise.