Hitman 2 Whittleton Creek - Easy Peasy Suit Only/Silent Assassin (no commentary)

This is how I do suit only, silent assassin. This is probably the easiest way to get the achieve. When it comes to poisoning the old man, you can try and poison his tea to save some time, his guard has a higher chance of finding his body in the downstairs bathroom, it can be done though. I prefer to poison his oxygen mask and kill him upstairs.