I suppose you could ask him to teach you directly, but then, he probably never learnt from his dad and figures it somehow comes naturally with practice. No one ever directly taught me...I learnt by observation and simply doing.
Early in my teens, I would use Noxema as a shaving creme, later real shaving cream, and now, I use simple soap to soften the skin followed by a standard, disposable razors. I have never found an electric razor that works for me and refuse to spend hundreds on any of them. Funny thing, I did not achieve a full mustache until age 18, the rest was spotty peach fuzz until about age 17.