The level of how “good” you are is defined by your competition. For example, if you are playing with neighbors once a week around a home table, a little extra self-improvement effort makes you the big frog. In a pool hall, the regulars are of higher caliber. It will take a lot more time and effort to improve enough to become competitive—and a lot of practicing (and instruction) to rise to the top of that group. There are three things that determine good: Breadth of knowledge