There exists only the present instant... a Now which always and without end is itself new. There is no yesterday nor any tomorrow, but only Now, as it was a thousand years ago and as it will be a thousand years hence.
Now is the operative word. Everything you put in your way is just a method of putting off the hour when you could actually be doing your dream. You don't need endless time and perfect conditions. Do it now. Do it today. Do it for twenty minutes and watch your heart start beating.