Yes. I trained dogs before, but only personal dogs, not professionally. I got lucky that my prior training techniques were very similar to the industry standard, so it was a relatively easy transition.

We probably run about 50 training scenarios for every 1 deployment per dog.

Ideally you’d be training from a 3 month old puppy until they are 18 months before they can test, which would include at least a couple training scenarios a week from in that window, so you’d probably have 150+ training scenarios before you even test. Additionally you would be doing daily behavioral training, similar to what you’d do if you want a very well behaved pet.

After they are certified, you’d still run 1-2 scenarios a week, 3-5 day seminars a few times a year, plus other related cross training if you want a high level dog.

Every region across the world has it’s own standard of what they consider a deploy-able dog. Some are highly paid, expert dog trainers that deploy in extreme situations. Some are casual retired bored rich people that want to take fluffy to something exciting, and just show up to random emergencies saying they can help, and have no actual formal training.
Most are highly dedicated volunteers that spend an extreme amount of time and money to ensure they meet the highest standards just in case they are called on to help out with people’s worst days.