Yes, the training can be delivered by firms in-house, but, aside from its complexity, the subject can be exceptionally dry.
The key is it has to sink in.
Clearing is not re-visited in advising clients on a daily or weekly basis, but the knowledge does have to be retained. Lawyers will have to understand the subject and use what they have learnt.
Clearing is actually a fascinating topic, and Paul will be able to share his enthusiasm, and deliver a memorable session. By giving the information its context, it becomes easier to follow, and the connections can be seen.