Process improvement is usually gradual, a series of small improvements that add up to a large improvement. James Watt’s breakthrough innovation of the steam engine doubled the efficiency of the suddenly obsolete Newcomen engine. But subsequent incremental improvements quadrupled the efficiency..
It’s not that hard, but it takes discipline and knowledge. Understanding what to change requires knowledge. You must know the steps in the process, what each step does, and what the results look like. With some modeling one can then foresee the effects of a change. Changing only what needs to be changed requires discipline. Don’t try to do too much at once.