I used to play sniper alot. All I think you need to do is to guard the flag station or rush as fast as you can to a hiding spot on the opposition's side without anyone seeing you.
Usually when I guard the flag station I find the deepest cover closest to the trail or open area. I had a couple of people walk almost on top of me even though I equip myself with basic woodland camoflauge.
As for shooting I just focus on eliminating the guy before he can tell his teamates where I am at. That means you DO fire 3 shots or more at the guy to make sure he's OUT. After he calls out, look around you 360 degrees. If you have good cover, you will have other targets homing in on the location. There also might be other guys with him flanking or bunkering you. If you can elminate the whole fire team, which is usually 2-4 guys, move to a different location. Don't move until you have scrutinized the area for more hostiles looking for you.
One day we were playing a woods game and my entire team got wiped out. I went into some moderate cover and 3 people literally SURROUNDED me on all sides. But guess what? They didn't know where I was....10 feet away from them. I went ballistic and strafed and ducked and fired like crazy. I went from sniper to assault. I was so crazy I had my barrel in the last guy out's gut asking him if he was out. While I was fighting I would see one of the guy duck at the paintballs I was unloading on him so I reloaded right in front of him. When he reacted to the paint, I just strafed to a different angle. He didn't see me because I was firing with thick grass between us. As I got him out the other 2 guys locked me down, so I did what they didn't think I was going to do, I just rushed right on top of them. The last guy was easy because he wasn't with the group. He had $1500 autococker, while I only had a bruizer pro. Ok that was 4 people
.
In the end my jaw was shaking left and right uncontrollably, but I won. We checked to see if there was any paint marked on me, but there wasn't any. In the entire ordeal paintballs were grazing me all over the place but not on me. It might of helped that I prayed before I fired my first shot.
I don't really play sniper as diehard as I used to now, because I am trying to get into tournament paintball. I never really do get as intense as that one firefight anymore. Right now I have a stock 2000 autococker with 18inch boomstick barrel (just in case
). Just going to upgrade all shocktech.