I agree with SE, a good book on DIY jobs will give you some practise in the home. Though most of my own skills were conducted at the industry college, for adult training and upgrading in Denmark run by the Union. Hundreds of different courses available. Though I doubt they have it here in Singapore. The UK have technical colleges that run night time course too..
Things like drainage and concreting I found quite interesting and useful to have the course certificates, as most labourers in UK have no theory but lots of practise, which turns out lots of cowboys.
There is no point in starting a job at all, if you are not going to do it correctly and by the book. Once you know the theory and you get some practise behind you, it will pay off in the long run, and you will never feel that you cannot survive..
It's surprising just how a person with theory and no practise also stands out as unqualified in Singapore yet they have been CEO of logistic and storage for years and yet they believe they have the experience.
Commonsense on racking and storage for example is also gained through knowledge of what racking can bear in terms of weight, and the boards used for supporting goods.
I warned an Ex CEO that he didn't have much idea of logistics at all if he was telling his workforce to stack those heavy boxes of 13kg each on a light frame racking system, one could see that only 4 tiny welds held the racking together. I would have been worried myself if i climbed on it. It collapsed the day after luckily little damage, though any person with a little bit of experience in stacking and racking should have known better.
Practice is essential and the more you get the better you become, in the early days, i always did free jobs, just to get the experience, people paid anyway, because they didn't like to take advantage, though i only offered to do the DIY jobs to gain experience. having a good eye of lines and levels, weight capacity, and weaknesses is very important.
Our new factory unit had weak spots on the drainage system only 4 inch wide with plastic covering, which i spotted the first day, the contractor said he would fix it, and laid normal tiles over...this is in a warehouse with pallets with over a ton in weight being moved around. The contractor should have had more sense, he has a great deal of experience, the problem was his workers did not.
So the tiles just caved in with the weight of the pallets being pulled over them.
They do have colleges here, so maybe you can join some night run courses, you can ask at the local community centres, they will know where to send you for training in basics of electrical, plumbing, welding and such.
My upgrading on welding was a disaster, I had to weld a water tight box for the exam, and water just ran out like a tap. ha! The second time around I managed it, trust me it looks easy, but its mastering the technique that matters.
Though you are better off to start at rock bottom on a generalisation course to understand technical drawings, tools, and doing handcraft in metal to specific tight measurements. Reading the drawings of any description be it electrical or building work is fundamental, before getting involved in practise as bad habits can be formed which are difficult to drop if the preparation is not done correctly.
There is a system with every project and to do it right, you must have everything that is needed no short cuts.
