I have just answered one of your earlier questions, before I realised you had posted more questions on the time spent learning. Not being a Bricklayer or Plasterer, I can't tell you what would be quickest. I am a time-served journeyman and know that to achieve the best you can in any profession, you need to spend time learning properly BY qualified people. Is the reason you want to learn quickly purely for financial reasons? The reason I ask is you would make more money in the long run if you work hard and qualify properly, rather than just learning how to lay a couple of courses of bricks. Good luck anyway!