An old joke in my family ran like this:
A man is lost in New York City. He can't find Carnegie Hall. He stops and asks a wino, "How do you get to Carnegie Hall?" The wino paused a moment and answered, "Practice, man practice!"
That's pretty much what I heard from an airbrush expert this past weekend. He spends time doing drills, thousands of them. He can create strokes that look identical because he's done it thousands of times. I'm not saying you need to press the keyboard shortcut for the Brush tool a thousand times. You do need to continually practice what you learn. Use it or lose it.