Enable the "Megaforce mode" code and position yourself where you started.
Then, get the Sniper Rifle from the garage. Drop them all except for the Fiber Wire and the Anesthetic. Hug the wall so that the guard in front of the garage will not see you. There is a little corner near the gate on the inside of the mansion grounds where you can put your weapons. Just follow him and get back slightly so that he will look around, stop, then turn around and walk through again. Wait until he turns and starts towards the door, then head shoot him with your 9mm SD. When you start out, run to the man carrying the groceries. Take the pictures back to the agent, and follow your map to the exit. Take his Sniper Rifle, and take out the other yellow icon. Sneak up on the man at the window and Fiber Wire him. Wherever the stationary icon is, go into the storage thing under it, and go up the stairs. The stationary icon will be somewhere in one of the two main plaza areas. After the intermission sequence, look at your map and find the yellow icon that is stationary (another one will be moving). Go in, and a man sitting at a chair will fire two shots in the air, but no one will be alerted. Look for the small red weapon pick-up icon. Note: This is very hard to describe in detail because the position of the agent is different each time. Take his clothes then get out of the building. After that, walk up behind him (there is no need to sneak), and use some Anesthetic on him. On your map, this is the bottom right building with a silver icon. Start the level by running into the city and move in a general direction to the left until you reach a building.