The most important factor for improving quickly is a clear understanding of each Stage. That means recognizing the mental faculties you need to cultivate, as well as the correct methods to overcome specific obstacles. It also means not getting ahead of yourself. Be systematic and practice at the appropriate level. Just as a scalpel is more effective for surgery than a large knife, skillful means and positive reinforcement are much better for pacifying the mind than blind, stubborn persistence. Finesse and patience pay off.