Of those who start the process, most make it through the system and end up with some form of commercial licence. It's not easy, it requires loads of cash and will take 18 months or so. The biggest problem is getting the job. I'd suggest that the failure rate here is currently in excess of 90%. But worse than being unemployed, these people are destitute. They will probably have crippling debts and be unemployable in their chosen careers for years to come.
PM