Another thing, you say: 'Only headshots count as damage' now that is not a good idea, I remember when I played in some hs-only servers, and it's *not* the same as the real thing, because if you can only give hs you won't get any screenshake for bodyshots.

The best thing you can do is playing in some server with good players and lots of fights, then enable hitsounds only for headshots (b_hitsounds 2 on etpro, cg_hitsounds 2 on jaymod, I don't remember for other mods, but it should be possible) and really focus on hitting the head. If you kill someone, but without a hs, you should consider it as a 'fail'

If you have a friend and a server of your own (or you can host it in your pc) you can do that training I mentioned before (1on1 with /give health 10000) but again I think you should play in real servers, and not against bots.

gl with your training