Wow no guides for this.
I guess ill just give some advice. All the missions i found very easy and it is not hard to get the bonus for each hit either and if you do say kill the person the wrong way you get the option of replaying the mission till you do it right so really its not hard at all. One mission i did find hard was you had to kill your target before he blew up a warehouse. Not sure of the name of the hit but it was in the warehouse north of the dons compound. I had about 6 goes and each time got nailed as i was rushing to kill him but not killing the guards so they kept taking me out. Then I found if you just walk in the compound, kill the guards and take the first right as you pass through the gate, walk up the stairs, open the door but do not enter! If you go into aim mode you can just see your target at the far end of the warehouse ducking down. You can see the white target over his head. if you dont go through the door no one will try to shoot you. I just took my time, aimed at his head, one shot and the mission was complete in under 30 secs.
Hope that helps If it did please leave a comment!