My question is how to successfully overthrow a modern government. Especially a democratic government that has 3 branches (legislative, executive, judicial), like Australia, Switzerland ... How to plan a Putsch/Coup d'etat without being noticed by an intelligence agency and when is the best time to attack ?
But I'd also like to know:
-How to overthrow multiple governments at the same time?
-How to control a country/countries shortly after a Putsch/Coup?
-How to prevent being killed during a Putsch by your friends?

I would be pleased if you could name any historical Putsch/Coups that have overthrown stable or even multiple governments.