a lecture becomes boring is when the trainer makes it boring
The point of Human Factors training is that it is not a lecture and it is not carried out by a trainer. OK, substitute "should not be" for "is not" in that sentence.
A really good Human Factors training session is a facilitated and guided discussion among those present, who should come from all parts of the organisation, which aims to introduce the topics in the syllabus, and to draw out attendees' own experience and knowledge, leading to conclusions about what they AND THE ORGANISATION can and should do to reduce maintenance errors, with particular reference to the "dirty dozen" known causes of errors.
The facilitator must be an experienced aircraft maintenance engineer who can apply his/her knowledge and experience to lead the discussion.
Standing up with a Powerpoint presentation to "teach" Human Factors is a waste of everyone's time, unless some or all present can catch up on their sleep, as they probably will.
I do realise that I'm talking about an ideal world, but there's no harm in having an almost unattainable target to aim at.