When sniping, get into a nook or cranny or other some small place where you 
can either crouch or go prone. You should also try to get a good view on 
your targets. Tall grass is also a great idea, or even better, an area where 
people will not realize you are there (for example, camping on the enemy's 
spawn point). When sniping on a very tricky target, or if you do not want to 
be seen, try your best to pull out your pistol and use your binoculars to 
spot your target. It is interesting how much less obvious your position is 
if you use your binoculars. Although many people will debate this, do not 
take any more shots than you need to. If possible, try to take them out in 
one shot. Do not shoot unless you are sure that you can kill them without 
one of their friends recognizing your position.