Even Napoleon Hill of Think & Grow Rich fame and Dr Maxwell Maltz of Psycho-Cybernetics fame had shared similar sentiment, as expressed here:

“Do not wait: the time will never be 'just right'. 

Start where you stand, and work whatever tools you may have at your command and better tools will be found as you go along.” 

~ Napoleon Hill;

"What is opportunity, and when does it knock? It never knocks. 

You can wait a whole lifetime, listening, hoping, and you will hear no knocking. 

None at all. You are opportunity, and you must knock on the door leading to your destiny. 

You prepare yourself to recognize opportunity, to pursue and seize opportunity as you develop the strength of your personality, and build a self-image with which you are able to live - with your self-respect alive and growing." 

~ Dr Maxwell Maltz;