I follow a fork lift course recently and they talk about the occurrence of accident in relation to the number of years of experiences.
They show that beginner and people with more than 15 years of experience are the two groups with more accident. The first one because they don't know enough, the last one because they did the technique too much time without problem.
For the fork lift, every driver most follow an other courses after three years. For climber...how do you revise your safety technique?
Fork lift = Pick up things and them put down (i.e. Fitness Planet)
Rookie Climber = No's not to much (i.e. This clothes line do should the trick!)
Expert climber = Thinks knows he more (i.e. Deeze bolts are great, this cam bomber not so much lets who see I can confuse)