Oh by the way did mine in 1978 full apprenticeship and got C&G advanced, we also did leadwork and glazing was part of the job to, i worked for my firm for 5 years then bit the bullet and went self employed, still learning till this day things have changed in a huge way new products etc.
So my answer is it takes a dam sight longer than 2 weeks or even 2 years to be let loose on peoples houses, i blame the goverment, also standards are low workmanship etc, my theory is simple, when i complete a job i would be happy to show anybody it, and put my name to it, maybe i have been lucky but in 28 years of been self employed i have always got paid, its not just the work you carry out but its also the way you treat customers, like turn up when you say you are, dust sheets, politness to customers and treating there propery with respect, leave job as if you hadnt been there by hoovering up etc, its all common sense really, or am i old fashioned but that how my boss taught me.