I can't speak for anyone else but when i did it i went all the way west from the gate and then north as far as possible. Hide behind the west wall hidespot and then make a dash for the hedge along the north wall. Run to the centre hiding hedge and then when the guards are gone click the lattice on the walls and you will climb onto a balcony. Im certain you cant get in the mansion through the front. It took me ALOT of tries to make it into each room. If it gets too frustrating just log out :thumbsup: good luck!!