Get familiar with the map and learn npc routes but mainly learn target route and find ways to kill them unnoticed like accidents or where they are alone. There is always many ways to get them saso unnoticed. I had trouble with it in H1 but figure the map out and find out ways to get them. For example one of the easiest kills is ken morgan in bangkok. U can posion his food or shoot the celling chandelir when hes gonna eat. Poison kill and accident kill are perfect for saso. U can poison his food then make your way to jordan cross birthday party and poison his cake. U dont even have to see your targets. You are already in the exit when they die from lethal poison. Of course map expierance is key. Mission stories are also good way to find out what happens when you do x