Hi Tin,
My apologies if I offended you with my ignorance. I do tend to get a bit over exited sometimes...
Here are the facts. Close to 40 years ago I completed my apprentice training, and qualified as a fitter and turner. Since then I haven't touched a lathe or milling maching. I therefore had to start from scratch with everything. I am therefore a complete novice, and the only difference between me and somebody with no training, is that I might pick up a little faster, but both of us must start at the bottom.
I do enjoy this hobby tremendously, and I am gratefull for forums like this where the gurus are prepared to share their knowledge with others.