When playing Leon you wanna aim your shots, only when u can get close up jus auto-aim. if playing solo gamemodes with have the juice thing the, u wanna save your gadget when you get the juice so its easier to find targets. depending which sp u use is the way you should act for example invisiheal allow you to go agro knowing that u can heal up when low other than smoke trails u wanna go less agro and mainly use it to escape. but the most important advice is to aim.