About determination I would provide a set of examples about risks and opportunities in processes, products, services and from the context, and I would train people to determine risks and opportunities.
About evaluation I would develop a simple matrix to reduce subjectivity in evaluating risk and opportunity relevance, and I would train people to evaluate risks and opportunities.
About acting, I would ask people to help develop actions to minimize probability of occurrence and/or minimize consequences of occurrence. I would also ask people how to monitor the implementation and effectiveness of those actions.
Show examples and invite them to be part of the approach.