Freestyle wrestlers and coaches are definitely not seasonal individuals who don't follow wrestling closely. Since the participants know what they are doing, the emphasis at local events is very much oriented towards having a good competition rather than just winning. This takes a major burden off the officials who do, occasionally, make mistakes. Competition rules for Freestyle are relatively easy to learn, and don't change much from year to year. A rules clinic is held for both competitors and officials just before every tournament, so there is always the chance to brush up or hear about something new right before the competitions start.
Most officials pick up on the scoring fundamentals in one or two tournaments.
The common concern most new officials have is that they wouldn't know what to do on the mat. Remember, there are three officials. When a new official is learning, the most experienced officials are out on the mat. If he or she makes mistakes, the other two officials will insure the scoring is correct, thus heading off any problems from the competitors or coaches. Freestyle officiating is not for those who want to make money.