jobo
Grandmaster
I cant tell you how many pe people I've witnessed doing bicep curls incorrectly, hundreds, many hundreds, that's why god invented steroids, so no seems to be the answer, people cant general teach themselves to curlIn what context are you asking? You replied to several points with that and it illudes me exactly what you mean. in terms of what i wrote about kenjutsu, that was a example of how you could home study decently with access to a training partner and media on the subeject for how to cut etc.
Just to re iterate, this is me stating you can get a acceptable standard via it.
The bicep curl i learnt on my own only using diagrams and videos. The point of me stating that is, do i need to have gone and paid for a personal trainer to learn that? or can we agree some things you can pick up by yourself, or at least some people can.