Agree on time spent with experienced engineers is best way forward. I've been doing alarms for years and I'm still learning new stuff.
Theres no apprenticeship scheme here for alarms. (Guernsey) but my thoughts are that the way things are going these days, an official qualification is a good thing for us as a company, our employees and our customers.
Otherwise i know at some point i know i will run into:
"ah you have a new employee, what training do they have?"
Me "i trained him"
"Who trained you?"
Me "this old guy, he was super clever but hes now retired"
Etc etc