I think a 3/4 year indentured apprenticeship all block release like what's been mentioned will make you a better plasterer, it makes sense. I did an indentured apprenticeship and never learnt how to dot and dab till around five years after so was taught how to plaster a wall. forget your dot and dab and skimming for a minute because that's all a site spread will do these days and that's all that's required but get onto the domestic scene in all types of houses this is where an apprenticeship shows it's worth. There is so much you learn in college if the teaching is there and the desire to learn is there. I was on a house today and have a lad helping me who doesn't want to be a plasterer which suits us both, I removed a picture rail today which he called a dado and I put him right. He asked the difference between the two and what's the point of them so I told him "the picture rail is exactly what it says you hang pictures of it and it's decorative". It sounds common sense but some people wouldnt know that then onto the dado "that's also decorative but in some instances it's a man made crack, the bottom half of the wall was plastered in a cement mix to make it harder in places that took a lot of knocks like hospitals, The top half was done in a sand lime Morter to save money". Now I know some will say it's boring or when are you gonna use that in the real world? But that's not the point you have learnt something which one day you might use when someone asks