Long, short story:
Am bad-to-average FPS gamer, looking to improve. Saw an OSU! gamer flinging its “shots” left and right and tried my best to mimick the experience in an FPS. And it worked significantly – all of my shots felt more “secure”, even with my aiming being rusty beyond belief.
And the “trick” to do this is simply leaving your “aiming hand” to aim (ONLY) while leaving your “non-aiming hand” to shoot and everything else. That’s it.
Oh I’m old and have been playing most FPS games on consoles for nearly 20 years. I’m terrible on PC but want to get better and seriously think it has to do with my death grip on my mouse. I still can’t use Keyboard as I’ve got bad carpal tunnel in my left hand and it’s near infinite pain after 10 minutes. So I use a mouse and a PlayStation Navi controller for WASD.
Heh, I’m also a old fart – 40 years old. Still, anxiety can also be a problem since it makes you anticipate your shots or freak out easily.