the only really good way to practice confirms is to go into training mode, do random guard and just keep doing it.
but before you focus on confirms make sure you can hit the super 100% without confirming, if you are having trouble doing supers out of any particular move when you don’t need to confirm it (free shots) then fix that first.
for example when i was learning to confirm standing close roundhouse i first just learned how to super after it without confirming. once i could do that 100% on both sides confirming was easy cake.
once you can hit the super from a move 100% without confirmation now its time to test the other way around, try doing the super as late as you can and still getting it to come out . you’ll be suprised at how late some of them can go.
now as far as the physical motion of the joystick goes, you will generally always want to roll one qcf when you c.mk so that you only have to roll one more to get the super.
however this is not always necessary as many times you can roll both qcfs after the hit and still get the super. usually in arcade mode as opposed to ps2 for that tho.
after you get all this down go into random guard and just try to hit 10/10 confirms on whatever super you can confirm the best right now. then pick the next normal you want to super from and work on confirming that. it can be frustrating but just remember to breath deep and relax when you are practicing, its easy to flinch when you see the hit finallly happen after 15 blocked c.mks in a row and miss the super. you need to be calm and relaxed but still alert.
its important to work on being really relaxed and deliberate while you play chun in particular because she is a “zero mistakes” type of character. you will find that confirming is the first skill to vanish if you get nervous in a tournament or a high intensity match so its important to just have something like this mindset:
im playing chun and its only a matter of time before my opponent hands me the win with a mistake, i dont have to worry because when i land a super its OVER and i don’t have to stress because chun will find openings where other characters cant. if i miss a hit confirm its okay, i still got some damage and some meter and (depending on how smart the player is) they are going to let me hit them in that same spot again cuz they are careless, or you can take advantage of them being afraid from being hit.
a good player who gets hit by c.mk but did not get hit with a super will be reminded to play more cautiously. you can use this to your advantage to throw them or play take a stronger position on the screen.
a bad player who gets hit by c.mk with no super will assume you can’t confirm it or doesn’t even care and will be more wreckless thereby giving you a free super sometime soon
hit confirmation is overall a combination of : muscle memory, composure (helped tremendously by situational knowledge, matchup knowledge), fast reaction and confidence.
i can hit confirm ken c.mk 10/10 on ps2 in training mode and while some have said you gotta be on meth to do it all you really need is to be relaxed and focused.