Don't quickscope targets that are far away.
I wouldn't really QS someone right next to you whos moving around shooting at you, just go for a lucky noscope, unless using a gheyacog.
Don't move when you are scoping in, and shooting.
I would say practice on some non hardcore sniper servers, becausue the crosshairs help, ALOT, but if you're just starting, normal gun games would kill you. Sniper only is best for beginers.
When you scope in, automatically shoot, and take scope out.
If you KNOW that you'll miss when automatically scoped in, just hardscope, who the fuck gives if you QS or not?
Or if you're good enough, try dragshotting!
If you miss once, and the emeney is oblivous and doesn't know hes being shot at, shoot again.
If he knows you tried to shoot him, and if shooting back at you, take cover, run away, or get your pistol out and shoot the fk out of him.
Unless you have confidence you can kill him, then resume QSing.
How to quickscope?
Go to a non-hardcore match. You see the crosshairs like +
Just put the enemy right in the center of your crosshairs
If you're close to them, their name should appear, and crosshairs should turn red.
Just scope in, make sure you can see the target, and shoot, release scope.
Simple as that.
Make sure you don't scope in too long, or else it'll be considered a "Hardscope", by some sniper maniacs.
Scoping for less then 2 seconds is quick enough for a quikscope IMO.