Since you are already doing programming, you must have a good foundation, and it is difficult to learn by yourself. If you want to master the relief quickly, first, go to the Big Dipper or Dongguan Sculpture Vocational Training School (since the Big Dipper, you should probably work in Dongguan). Second, learn from the master in your factory. Your salary for simple programming now should not be very high, right? Sharpening a knife is not a mistake for a woodcutter. I think you'd better study. It's best to ask for leave, just for a month.