When working in pairs make sure you cover each other. This prevents the other team from sneaking up on you and allows the person in motion to relocate himself without fear. Also while waiting for your foe to come to you you won't get nervous or impatient. It also protects you from being out numbered if your foes figure out where you are. The most basic rule to being a sniper is being unpredicable and also well hidden. Hide in the brush and more around to be unpredicable. Don't take a shot unless you know you can hit your target. Like that one general said in the revolutionary war, "Don't fire until you can see the whites of there eyes." Make sure you communicate some how through handsignals or whispering. Make sure the person knows what the handsignals are and that they are not to difficult. If the handsignals are to difficult they won't even use them.
If you have decide that you will become one of the lone wolf snipers, make sure that your foe comes to you. Situate yourself in an area where your prey will not be able to see you. This area should be somewhere near the middle of the paintball field, so that you can pick off the people trying to attack your base. Again like in pairs, wait until you have a clear shot. It only takes one shot to sniper someone off. Though for saftey sake, let off a three paintball burst. This makes sure that the person knows he was hit. Incase the paintball doesn't break that you have one more paintball heading right for them. If you miss, take another shot. If you are dealing with a veteran paintball player, make sure that you relocate. Because, he most likely knows where you are because of the sound of your paintball gun.