When I very first started, I lifted in the garage with some rusty standard plates and had no idea which lift did what. I'd "invent" lifts and because I didn't actually know what most of the lifts did, i thought it would only make sense to chase numbers... or at least try to. Routines were also full body because I didn't know of anything else and besides, didn't know of enough movements to even be able to plan a split.
No outside influence either. In my "developing" years, I had only lifted in the garage and always alone - it was my time and didn't want to be bothered. No cousin, friend or training partner telling me what was "best." Spun my wheels for a long.. eh, really long time, formed my own opinions and went on from there.
Still a long ways to go.