Hitman Absolution Purist Guide: Dexter Industries, Dead End, Disabling Backup & Security System

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This is the first part of the Dexter Industries Mission in Hitman: Absolution which is called Dead End. In it you navigate a road station to disable the primary and secondary security system and then gain access to the mill entrance. This guide explains how to complete this mission on the hardest, purist, difficulty. It does not explain how to complete the different challenges in this area.
When you start make your way to the first security house ahead. Take cover underneath the window and wait until the guard leaning on the wall leaves.
Then climb through the window and disable the primary security system. Go up the the next window and take cover under it, but on the inside of the security station. Wait for the guard walking by in the distance to almost be out of sight behind the car, then climb through the window.
Quickly crouch walk towards the 3 sided bit of cover ahead and take cover on the inside of the first wall you get to. Go all the way to the right of the middle part of the cover and wait until the guard to the left has turned his back to you.
Then crouch walk after the guard that has just walked past you rightwards and take cover on the pile of logs right besides him (don't worry if you hear the being detected noise, you won't be). Wait until the guard next to you has turned around and walked past you, then crouch walk towards the car ahead and take cover to the right of its tire on the back of the car.
Wait until the guard in the second security station ahead has just turned away from you, then make your way past the right side of the car and immediately take cover on the side of the barrels ahead facing you. Turn the camera around so that you can see the guards besides whom you took cover earlier. Wait for him to just have turned his back on you.
Then make your way towards the side window of the second security station and climb through the window. Disable the secondary security system and turn around and take cover on the table with the wrench on it. Take the wrench. Wait for the guard you waited for to turn earlier has walked into the security station and turned his back on you. Make your way out of the other window and take cover behind the wooden wall ahead. Throw the wrench in front and to the left of the guard standing in front of the security station.
As soon as the guard is distracted make your way towards the stairs ahead. Go up them and through the door to the right near the top of the stairs. Go right again inside and approach the exit door. Once you have picked the lock it is the end of this part of the mission.