I have no idea what you guys are talking about. Piffffff... My first time out, i took out the entire enemy team with a UHC Super 9.... with open sights.... hand loading one round at a time.
P.S (yes i'm trolling a little) ...
P.P.S (but it's still a true story,the other guys were idiots

)
I will give you this one major tip. It's the absolute secret to sniping , airsoft or otherwise. It can all be summed up in a single word
Patience
Other than that.
On the field, Wait, watch, listen, hide, flank, your team is both your shield and your responsablity.
When off the field. Read, shoot, shoot, shoot, tinker, sleep with your rifle (i literaly mean sleep, no funny stuff, and don't laugh, we have ALL done it accidently at least once).. Shoot some more.. shoot, learn camo, wear your gear around the house until its like wearing regular cloths,, shoot, shoot... Wait... did I remeber to say shoot?
So, yea, all this is ment to be on the funny side. Why, the worst thing an airsoft sniper can do is take themselves too seriously. That's a one way ticket to mediocrity. Sure, like any other sport you get out what you put in, but don't forget to have fun doing it, and if sniping stops being fun, stop doing it! You bought a nice rifle, don't give up until you have felt that satisfaction of nailing the guy that never saw it coming at 80m and saving your whole team, or enabling them to take the objective. And when that happens, say nothing and smile to yourself knowing YOU just won the whole game.
Last bit of advice. I could go on and on about tactics, field craft and gear, but the other guys have that covered. Its all here and it's important! There is one thing that a lot of us never talk about because it's hard to explain. This is going to sound weird but trust me. Most of us who have had any real success in this role have learned at some point that when you relax, and become "one" with the world around you, and start to "feel" the game as if all the players and all the elements of the enviroment are part of nature, part of you, then you will find much more success. Don't force things, follow your gut. You'll get shot a lot early on, thats ok, but your mind and body will learn from that. It's the way i would imagine the Force would feel like if we lived in a galaxy far far away.
Yes, i know i'm nuts, but most good airsoft snipers are a little nuts. Ask 1tone, Reiku, Plazma, AHP and some of the other old timers here. Come on!, you have to be a little nuts taking on 40 guys with 10,000 rounds of ammo shooting at you at 33 rps with crazy HPA rigs and all you got is 70 rounds, a bolt action and maybe a pistol!!! Airsoft sniping is both the hardest and easiest role to play. It's also the most dissapointing and the most rewarding role in the game. Learn to accept that and you'll be on the right track.