Ok, so I was in middle school when the Rubik's Cube craze hit the streets. The world was a lot simpler then, maybe because I wasn't an adult yet, who knows. Pre-internet, you could still dial 5 digits on the same exchange locally.
So I never got more than one layer on my own. But then in about 1996 a friend showed me how to solve the basic cube using a guide called "The Ideal Solution" published by the Ideal toy company. It was surprisingly simple. Not as elegant as the F2L OLL PLL solutions that I still haven't mastered, but as far as memorizing seven basic steps it is pretty much stupid easy.
And then you add on a few additional steps and you can do the 4x4x4 Rubik's Revenge and the 5x5x5 Rubik's Professor.
And as proof that I am like a serious level nerd, I will post some of the videos I came up with when I was super focused on learning the stuff.
3x3x3 Rubik's Cube
4x4x4 Rubik's Revenge
Edge Flipping on the 5x5x5 Rubik's Professor
Edge Pairing on the 5x5x5 Rubik's Professor
Solving the 5x5x5 Rubik's Professor