After school I started an apprenticeship as a product designer and advertising specialist but dropped out after two years due to personal reasons. That was and is not my world. Nevertheless, I drift into this direction in my private projects every now and then when I want to learn something. For example, I had an idea for a Samsung Galaxy S4, but I didn't want to use my own smartphone. So I built this Samsung Galaxy S4 study out of Dollar Store plastic board for the kitchen, putty and a lot of time. By doing this, I was able to teach myself some new old techniques that will lead me to build better models. In total I worked on the model for six months and a lot of studies about color, material and surfaces were made. I am only partially satisfied with the result, because I could have sanded the surface much more, but I didn't have the money for the material at that time. Now I don't want to work on it because I'm afraid of destroying the paint. So I decided to leave it imperfect and enjoy its aesthetics. There is only one mistake I am really annoyed about and that is that I never wrote down the paint and I could never remember what color it was.
Here's a tip for people who want to get into classic product design. Learn the basics. Yes, you can create your ideas in 3D with e.g. Blender or Freecad and then just print them out, but that doesn't make you a good designer. Craft and a good education will make you a good designer. Take a look at Eric Strebel's videos and you'll see who has learned this professionally and knows the oldschool tricks. Building a Samsung Galxy S4 in Blender is super easy and within an hour you can do it. But drawing the smartphone yourself with design markers, paying attention to the perspective and then rebuilding it with super cheap materials is more difficult. Of course, it's not better, because when you make orders for customers, you take the process flow that works the fastest and best. But it's still good to know the basics and then transfer them to modern production processes.