Success at anything will always come down to this: Focus & Effort. And we control both.
Most people fail in life because they major in minor things.
Energy and persistence conquer all things.
“The sure sign of an amateur is he has a million plans and they all start tomorrow.”
The amateur only works when inspiration strikes. The pro sits down every day and puts in steady work. The key is steady. Not irregular or extreme.
But spending the right amount of time on the right tasks needs planning which is nicely explained in this article on time blocking.
The successful warrior is the average man, with laser-like focus.
Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment.