Hi mate, I can give you the benefit of my experience on a similar sounding course. However, i had one advantage, 20+ years electrical experience on aircraft electrics. I did a two week installation course, one weeks 17th edn and a further week of inspect and test. It has to be said that with my previous experience i found the practical side a bit of a breeze, fault finding not a problem at all and the inspect and test was pretty much what i have been doing for all those years. However. I found converting all my prior experience into the 17th edn and the other rules and regs VERY hard to manage, the courses are so compact, that I had to study 5 or more hours extra each night just to convert what i already knew into the domestic field. (Different terminology etc). There were others on the course who had very little or no electrical experience who fell along the wayside as we went along. My point is, do some research before you commit a LOT of money that you will not get back, before you decide. Buy a copy of the 17th edn maybe and see what might make sense to you. Buy a basic electrics book, online guides and just see if you can learn a bit before you commit. Try before you buy so to speak. You could perhaps even try for a bit of work experience.
Whatever you decide, good luck to you, just make sure you are sure you know what you are in for before you spend a lot of money.