i use CCF grading subforums to hone my grading skills, when someone posts a coin for grading, I review the coin, place a grade on it and then read everyone's comments. its like going to grading school. the more you do, the better you get. I have been collecting for 45 years and am always learning. I am just starting to learn how to attribute Large cents. I would key in on the coins you collect most...are you a Lincoln Cent collector or Barber dime collector. start with the area of most interest to you and pull up the photograde templates and study them against your collection. good luck and stay plugged in to this site, its indispensable. 
http://www.pcgs.com/Photograde/
http://www.pcgs.com/Photograde/



















