Movement:
When it comes to moving, always keep your maneuvers flowing and nonstop. Don't stop unless you need to reassure your witness of some form of plan, or perhaps you need to really just catch a breath now and again. When taking the enemy on, always keep yourself on your toes. If you can dodge at any moment, you're in good shape. Keep your enemy within range, but keep yourself behind cover. Change forms of cover now and again to keep things off balance when it comes to the enemy making a move. Always be within range of them so that their is a constant threat. And keep flanking. Always be making your way around the enemy because creating new avenues of fire is priceless. You have to keep the enemy from being able to make a move that you can't control. They have to always be kept on the recieving end by your unwavering wit under fire. You have to keep the enemy concentrated, and move along with him. You need to keep him within range, and always a target. If you can manage this, congratulations.
Accuracy:
This can seriously only come with experience and in most cases, sheer talent for the shot. If it doesn't come naturally, well it's going to take you some time and practice before you can just pop off crazy shots left and right and damn near always hit your mark. But that's really the extent of it. Time will really be the deciding factor for most Assassins, as will be the frequency of games and whatnot. If you don't war nearly enough to sharpen your skills, take pot shots at targets from varying distances. Such as 20 feet away, 35 feet away and so on.
On your feet intelligence:
Alright, you've got a relentless assassin breathing down your sweaty neck and you could get capped at any moment, what to do you ask yourself? This is what I'm talking about. You have to be able to save your ass when it comes down to the end. You should be able to on the spot think on your feet. At any time or any situation, you should be able to turn it against the Assassin. If you can manage so, the enemy will surely revert to the defensive. And entail, place you under the status of "offensive" and let you get the hell out of there to live to fight another day.
Sharpshooting
Though snipers are surely non existant in this Nerf day and age, a select few can still refer to themselves as the sharpshooters of today. These are the players that, cloaked in stealth, manage their way around the Target and take them on accordingly. They are great marksmen who can deal damage and death from untold ranges. And they do it with style. Many refer to themselves as sharpshooters, however, as you and I know, not many are. The majority simply find the title to be flattering and cool, but those that understand the ways of the true sharpshooter, know otherwise.
"One shot one kill", is the sharpshooter creed. Can you pick off the Target from excessive ranges? Probably once and a while, but are a consistantly good long range shot? That's what you need to be if you are to concider yourself a sharpshooter. Another famed and much needed aspect of the Nerf sharpshooter, is discipline. When you take that shot, you need to know that it was the right time. And you need to understand, deep down inside, what the consequences thereof, could very well be. This should come with time, experience, and experimentation.
When a sharpshooter, stealth is key. You must move around the battlefield quickly and with great ferocity, only to expose yourself now and again. And when you do expose yourself, it is imperative to land that one crutial shot. Consistantly precise shooting could very well tip the balances of the game, and hopefully with your talent, give the advantage to you. When a witness, if you can provide long range cover for the Assassin and keep the Target off balance as your Assassin moves into better and far more opertune positions, you yourself are an incredibly tremendous and potent asset. Long range fire in conjunction with rushes/charges and accurate fire can be the best tactic when the Target is in immediate need of termination. You alone, are the bringer of foam death. And you alone, are the most capable on the battlefield. But you are only as good as your gun. This is the only exception thereof, otherwise, the player makes the player. You need a gun that is accurate as well a great long range threat. Such guns that I will focus on now, are guns like the SuperMaxx 5000s, and SuperMaxx1500s. These guns have tremendous velocity and their accuracy is unparreleled. Properly modded, they are the most formidable sharpshooter weapons currently available. Scopes are also not a bad idea. On air guns they are a great advantage that can do some great damage.