i'd say after one's first full season is a good time to get certified as RO. that way you have some actual experience that helps put the rules and theory in context. other than sitting inside in class and missing a weekend of actual competitive shooting, really no downside to taking the class. doesn't matter how fast or slow or good or bad you are. but everyone should really read thru the rules a couple of times a year, amazing what gets forgotten or mixed up, especially for some of us that play multiple games.