its just getting used to the area your in and keep moving you can camp for a bit but someone will come and get you if you stay in one place . keep looking at your uav it will show you where to head for, but dont run into the middle of a firefight
and at the end of the day its just practice
some also use modded controllers which give a better fire rate
and im sure if your on say 50 meg broadband you can be quicker