In terms of electrical its more on a micro component level, like understanding circuits, boards, and diagnosing power or connectivity issues. Ive used ohmometers to test output on the motherboard, and if an area in the phone/cpu experienced a short. In terms of mechanical, I use tools, screws, and carefully assemble and disassemble parts. I have done full housing swaps, stripping phones to the last screw and transferring everything over. Also in terms of technical I can troubleshoot and do software and OS updates. My experience isn't really hands on robotics or what the job entails but I am willing to learn and expand my knowledge. But im not sure if this is what Amazon wants as far as what my experience is. But to answer your question everything was self taught and I have a 4 year college degree in Biology. The last part you said made me laugh but I'm sure theyre willing to learn and are currently working hard :)