*Spoiler*
I've found you can take out the 2 guards on the stairs leading down to the cellar.
You just have to wait until the patrolling guard starts to head downstairs. You have enough time to stand at the top of the stairs (down a couple) and knife him (after getting the knife from the kitchen) without being seen. Then dispose of the guard at the bottom of the stairs and you have your uniform. From there you do the cellar area to get the key, then the pistol (which you dont even really need). Then you can get the uniform of the diplomat on the 3rd (I think) floor in the office next to the stairs on the North end on the West side(of the stairs). He patrols a bit but is easy to take down once you clear his office. Once you have his uniform, nobody will question anything you do other than the main target. Then it's just a matter of poisoning his coffe, which can be annoyingly difficult, but possible once the piano starts playing. Requires quick timing to not be noticed.
Doing it this way got me a "professional" rank and a mission time of about 40 minutes (with fumbling around trying to figure out what to do).
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