I play on the piano and occasionally on the saxophone, but now, I haven't practiced much of either, especially the saxophone. It has gone to point where I can only play "Fur Elise" as if I'm half lost, forgetting my place on the different keys and then painfully trying to bring back the melody. I can tell you, from experience, that if you want to be good at something, whether it be playing the piano or being the best quarterback on your football team, you have to practice at it constantly. Never try to be smug that you do not need to improve, because even if at one time you have all the skills, they will erode with time if you do not reinforce them with practice.