That's true. With no internet and only a crappy book, my use of the ZX 80 was pretty poor compared to what I would have mentally capable of doing, if I had access to further knowledge.
Cleverness could express itself in the way you actually gathered documentation... Back in those days, it was really tough to get any. For example, I was out of the scene. So I decided to create a disk magazine to talk bout the scene, hopefully getting in contact with it. That's exactly what happened and a s a result of that, I got access to one marvelous piece of software I couldn't write by himself : a MOD player (included with SoundBlaster DMA access which was very hard to code)...