You only need your Silverballer and M4 (in case things go wrong). When you start, go through the door and move left. Talk to the guard and get the real WWI pistol. Go into the bathroom and wait for a worker in green to walk in. When he uses the bathroom, take him out with either the sedative syringe or push him. If he does not see you he does not count as a witness. Steal his clothes then put his body in the container. Walk outside of the bathroom. Go downstairs and through the doorway where a man is working on the door. Find the stairs that lead to the area where the actors' dressing rooms are. When the agent goes in the bathroom quickly run into the door of the actor you are not supposed to kill. Place the pistol on his table. Go outside the door. Turn left then go into the double doors on the right. Go up all the stairs. There is a beam that you are supposed to put a bomb on. Place it there when the worker is not looking. Wait for the actor to shoot the other actor with the real pistol. When the second target realizes he is dead, he will rush down to the body and begin mourning. When he does, detonate the bomb. The beam will fall and kill him. Then, put your suit back from the bathroom and leave.