Here are some good tips for sniping.

1. Get to know your gun and what paintballs are best for your gun. I have an A-5 with a flatline barrel and i use a crossfire nitro tank. The best paint that I found for my gun is either Evil or X-ball. Team Colors is excellent but they sold out.

You are reffering to paint to bore match, there is a chart on the bore sizes of different barrels and the size of different brands of paint.

2. Know the way your paint curves and what distance it starts to curve. My paint curves a little at about 75-100 feet. I dropped a bird from about 60 feet away. The ball nailed it square in the head. It is very important that you practice with your mask on. You should practice exactly how you would play. Take moving shots, too. Get used to different distances and learn to judge the distance accurately. Use a long tapemeasurer to see how good your judgement is.

Paintball guns are far too inaccurate and inconsistent to expect results from that.

3. Before gameplay, study the field of play. Find all the possible routes that the opposite team could take and choose a suitable position with just enough cover to keep yourself hidden, but enough room to move and have a quick exit. Make sure there is at least two spots that you can safely retreat behind in case you are spotted or to get a better shot.

That, my friend, is camping, quite the newb method

4. When the game is about to start, do not make it obvious to the opposite team what direction you are heading. Circle around to your spot.

5. Get to your selected spot. It would be smart to take another player with you. I prefer to take a charger with me because if we somehow come upon multiple enemies, I will usually keep their heads down by providing accurate cover fire while my charger runs up to the bunker they're behind and takes them out.

6. Never fire unless you can hit the person and NEVER take blind shots. You will give away your position and will have to move while under fire. Set a goal to make One Shot Kills. By doing this, you will have the mentality of conserving and stealth.

One shot kills in paintball? BWHAHAHAHAHAHA.  Unless you are shooting very close to your target you will not get the accuracy to make a shot like that.  Firing blind is an excellent tactic because it draws the other team to your position and if they are trying to be "uber snipp-er duds" or trying to sneak up on something it will make them panic.

7. Always relocate after a kill or a shot, especially if your seen. The worst thing is for you to get pinned down. The purpose of relocating is to confuse the enemy. They hear the shot from one place and take cover to shield themselves from the direction of the shot. If you move quietly enough you should be able to flank them and light them up. It's also a good chance to earn some respect on the field. If the enemy is clueless about where the shot came from and don't know where you are, stay. But only stay for a little while, then relocate.

If your intelligent you dont have to "relocate" because you are always on the move.  Staying put in woodsball to watch a particular place is camping, a very noobish tactic.

8. You will probable want to have some camo on your mask, especially around the goggles. The goggles give a glare from light and are one of the first things spotted. If you have a colored gun, get some camo on it. Make sure your arms are hidden. A good technique is to cover them in mud. Mud will definately help you if your in a prone position. It is the color of the ground and not easily spotted.

A good set of BDUs are all you need.  You dont need some ghillie suit or to cover yourself from head to toe in crap.

9. Watch your back. Their could be other snipers around or someone could be sneaking up on you. Relocating helps with this problem becuase if someone hears your shot, they could come up right behind you.

Oh please, I'd be more worried the little fat newb with the brass eagle wearing a red shirt then other "snipers". 

10. If you want to spot other snipers before they see you, just simply
think of the spots you might choose.

You mean campers, right?

Scan the area. Look hard because they are usually well hidden

You mean crouching in a bush with a mismatched ghillie thinking they are "invisible"?

unless they are wannabe snipers that don't have a clue about anything.

Hate to break it to you buddy but every "sniper" in paintball is a "wannabe" and fits that description right there perfectly.

Quietly approach your area of suspicion. Make sure there is plenty of cover to hide behind if you get caught. If you're taking fire, try to pin the sniper and have the man with you flank him.

Assuming he isnt "intelligent" like you and has an extra person there?

Do this quickly before reinforcements arrive. When that happens, you will have a difficult time. In that situation, one of you should give cover fire so the other can move up. Alternate this pattern back and forth until you can get a close shot. Watch your back.

11. Sniping is about stealth and accuracy.

Two things practically impossible in paintball.  Face it, paintball guns are INACURATE and INCONSISTENT. Furthermore, I dont care how "awsome" your "m4d sn1pp-3r dUd sKILLz" are you will fidget and crash through the brush, making stealth something that wont happen.

Staying calm and not panicing is the key. Take deep breaths while waiting. When you see someone, keep calm because naturally, your instict to fire right on sight takes over and the adrenalin flows too much. That is how many rookies and even experienced players get caught or shot out.

Kiddo, we covered this, EVERY sniper is a rookie or newb.

Just breath slow and stay calm. Try not to move your shoulders when your sighting someone. your aim will be messed up. Remember to judge the distance and remember the curve of the paint at that distance.

Keep these tips in mind while playing and your sniping skills will get better. It will take time though. Have fun

7. Always relocate after a kill or a shot,   

hey darur,

you suck