If you go down the road to a particular place, you do not know if you will reach it or not; but you are on the road that goes to it. That is what is under your control, and that is the only way to accomplish anything.
Equip yourself with skills , because that is something you can do. Exert effort, because that is something you can do. Take every precaution and make every preparation so that, if you do not reach the goal, it will be due to whatever is beyond your control. Any other failure is self-defeat.