Demonstration
Step-by-step guide
1
Line up
Align yourself using this visual reference
2
Aim crosshair
Place your crosshair here

3
Throw
Press the keys to throw the grenade
Left clickRight click
Hint
Take the doors position from the preview, aim at the marked point and throw with a plain left click — standing, no jump.
Practice from exact position
Paste in CS2 developer console to teleport to the throw spot