There are so requirements to be a sniper, and this may be a bit obvious but to SNIPE you need a Sniper.
I prefer the AWP because it's ammo is so common so I can afford to miss a shot or two. The perfect hiding spot for a sniper is a place with elevation, and a spot where the sniper can pop up, take a shot, and pop back down. A good setup for this is the City, with a tall skyscraper you are introduced to a high elevation barricaded place.
Being on the top of a skyscraper is a bad idea, it is a common camping point and will result in a guy spawning behind you and shooting you. I'd suggest maybe the 2nd or 3rd down from the top. Pick the right sky scraper, you want one with a view of the construction site and of a view of most of the other buildings.
Now for the set up, as I have noticed the barrier of the window blocks about 40 degree of space. To explain this better, you can't aim very far down as the barrier will block your sight. The solution to this is simple, get a Girder and set it at the edge between the Barrier and the floor. When you see an enemy walk onto the girder and you have the opportunity to shoot almost directly down. I warn you though, do not sit there for long as you are an easy target. Here is an example:
http://imgur[DOT]com/RMr7zmz
When aiming I suggest you set your aiming settings to Toggle and not Hold. This lets you focus on aiming and positioning your mouse.
A sniper is a support weapon, you should treat it like one. Having the sniper as your main weapon will result in you losing nearly any up-close battle. Have a Sub machine gun or something automatic as your primary for defense. A good example is this:
http://imgur[DOT]com/Eb0alBR
~Sharpshooter26/firemonkSEE |