23 of our members attended a First aid short (3 hours) course last year run by a St John's.
(We also have 5 members with full first aid certificates)"
The short course included a 10 minute demo of one of the latest defibrillators.
The St Johns trainer running the course reckoned that is all the training needed.
She also said that a short training video is also sufficient e.g.
eg https://youtu.be/7LRP1zbsdO0
If you look at that video you will see it is straight forward and far from rocket science.
The defibrillator talks to you and tells you what to do.
It has an impressive sensing capability that will not shock the patient's heart unless all the sensors report correctly.