Always have a contingency plan, because Murphy's Law is always in effect. Even the best of plans can go wrong. This is "Life," nothing is perfect. Do not allow the probabilities, or better said, the possibility, that things will go wrong to paralyze you to an inactive state. "If you get knocked down in the dirt, get up, brush yourself off, and continue on with your contingency plan." Success happens when you don't have the "idea of failure" in your vocabulary.
I will say no more. You get my drift.