You won't learn any practical knowledge Sam just by asking questions, it comes from experience an knowledge, you may blag the interview and get taken on as an Electricians Mate, but what will happen when you get told to do something you have very little knowledge of, other than asking a few questions on a Forum. There is more to deciding which cable or OCPD to use, it takes time, training and hands on to learn even the basics of electrical installation work, not something you can just pick up, as you muddle along, sorry for my blunt reply, but it irks me now end when Guys think its easy, do some courses and then come back and see how you feel about it then, in the mean time good luck with whatever you choose to do.