Although Deadeye/Blackhand is harder to find its still not that bad, best idea is if the map has spawn weapons, get a Blackhand Stealth and find yourself a rifle
Moving doesnt always help your position.. one game on C&CUnder i was blackhand and stayed in the NOD bunker side for about 20 mins.. took out like 5 snipers who came for me.. 2 were Havoc.. i musta ****ed them off
Anyway dont waste ammo on vehicles unless they are engaged or far from you (behind more so)
Always go for head shots!! i cant stress this enough! If someone takes damage from a Sniper its Instantly noticable, its not sloppy like an Auto rifle or automatic weaponry.. its a clean hit, if you got 200/100 the 100 Armor will leave and you'll have the 200 left, then you know a sniper hit u.
I have more trouble hitting moving targets than anything else personally.. i usually stay at around 50\% Zoom so i can scan easily and zoom in on anything noticed.