In many ways, killing is tied in with movement, and it's vital. The method by which you kill your enemies will change, based on the situation you are in, and on your style.

Firstly, make sure that you are comfortable with the control keys, and are able to quickly select weapons, reload, holster, drop weapons, sneak and lean. These are vital to your success. Secondly, make sure you have the place cased out. Try not to kill people randomly - make sure that there is no one else hanging about, and if there is, that they are preferably out of earshot, but definitely out of vision. Dropping someone when a passer-by ambles past is never a good idea!

Hitmen, cleaners, murderer’s, assassins, professional killers. Very few people ever consider killing as a profession; but for more people than the world’s governments care to admit, killing other people is indeed their profession. Does our government train killers? Of course it does. Every government does. To believe otherwise is stupid. Today, the C.I.A., the D.I.A., the N.S.A., and each special operations branch of our armed forces all maintain elite “termination squads.” Then there is the Mafia, every person on this planet knows about a Mafia of some sort. Mafia hitmen are the most dangerous killers. Patriotism or nationalism doesn’t motivate them. They do it all for money. Fortunately, they are used exclusively in the organized crime communities to kill informants, thieves, traitors, and the like.
Regardless of who their employers be, all pro killers use similar techniques. It is these methods that assassins universally employ that we will learn..