Want to get better at this game? Go to more coin shows! Physically handle more coins and build more type sets for your own collection. The more coins you physically see, compare, and get familiar with, the better you can grade them. It will likely take some years of training your eyes to get somewhat comfortable with grading a few series of coins. Don't get discouraged, it takes patience to learn this. Nobody was born grading coins. We learn the art of grading by holding them in our hands :)