All you need in this life is ignorance and confidence; then success is sure. You can "already know for sure" things that could actually impede progress. Always be on the lookout for the things you did not know, that you did not know. Secondly, work on strengthening personal belief that a particular will be achieved regardless of any adversity that may show up, or evidence to the contrary.
Let us not pray to be sheltered from dangers but to be fearless when facing them." "Everything comes to us that belongs to us if we create the capacity to receive it." "Life is perpetually creative because it contains in itself that surplus which ever overflows the boundaries of the immediate time and space, restlessly pursuing its adventure of expression in the varied forms of self-realization." "The highest education is that which does not merely give us information but makes our life in harmony with all existence.
It usually takes more than three weeks to prepare a good impromptu speech. Overnight success is a fallacy. It is preceded by a great deal of preparation. Ask any successful person how they came to this point in their lives, and they will have a story to tell.
Sometime, somewhere you take something to be the truth. But if you cling to it too strongly, then even when the truth comes in person and knocks on your door, you will not open it.