Loop the map anti-clockwise
Bring a lockpick, coins and a silenced handgun. Avoid touching anybody unless it’s ABSOLUTELY necessary (it’s best just to lure guards away with a coin if needed). Take out Maya Parvati first with the falling hay bale; the best spot to shoot the rope from is from the rear corner of the shed next to it but you’ll have to be very quick to get there before you miss your chance until her next loop. After that, turn 180° and exit the gate and follow the external perimeter until you get to the side of the main building. Use the lockpick on the gate to enter the perimeter to right next to the main building, take out the camera above the stairs leading down to the basement and quickly hop up onto the elevated part of the lawn.
Ezra Berg’s next; when it’s clear to move, shoot the ride-on lawnmower’s engine to make it leak fuel (he’ll light a cigarette in this position). Loop back to the left where there should be two guards at the top of the stairs leading down to the basement of the main building. Use coins to distract them as needed — knock a guard out if you have to — and head into the basement (make sure you’ve taken out the camera above the stairs or you’ll get spotted). Knock out the guard in this area and head up the stairs.
At this point, you can use coins to try and draw Penelope Graves and/or Sean Rose into the basement but depending on the difficulty you’re playing on, they might send guards down instead. If they don’t come down the stairs, exit the basement when it’s clear and head up the stairs (be careful of the guard that will be near the balcony door upstairs; make sure he’s not facing you). Head towards the back room and use the lockpick to unlock the door to Sean Rose’s bathroom.
From here, depending on the location of the “balcony guard” and Sean Rose, it might be safest to wait in the bathroom (though remember that Sean Rose will routinely enter, there’s almost nowhere to hide and there’s a very good chance you’ll get spotted). The balcony guard will routinely enter the room at the back where there is a guard and a hacker on the couch; it might be best to knock all three of these people out in that room and hiding two in the closet at the back of the room (no-one else will enter/find the bodies once you’ve taken out all three).
Wait outside Sean Rose’s bathroom door until he enters and then kill him however you like. You can leave his body there. While you’re waiting for Penelope Graves to get in position under the chandelier, use coins to distract the hackers while you make a mask of Sean Rose’s face. Swipe the mask and head back down to the basement and wait behind the door. You should be able to hear Penelope Graves speak through the wall when she’s inspecting Sean Rose’s clock at which point, corner shoot the chandelier to make it fall on her. Then head down, scan Sean Rose’s face mask and you’re done.
Takes a bit of practice but that’s my method.