As with many things and in particular manual skills there is a big difference in learning to do something and being good at doing it. The key is experience. Both bricklaying and plastering are simple enough that any college would be able to teach you how to do it, the skill and quality would come with the experience. So to answer the question most local college's are likely to be do a course and be of a similar standard. Visit the local Job center (or what ever they are called today) and they will have plenty of bumf on where such courses are avaliable. Good Luck