The difficulty a new prince will have will depend on his ability. Private citizens become princes either through luck or through ability, but it is best not to trust luck. Those who become prince through their own strength have difficulty gaining power, but keep it easily. Establishing new states is always troublesome, because everyone who was happy under the old order will oppose change, and most people will not support new things until they have seen them work.
The question is whether innovators must rely on others in order to succeed, or whether they can rely on their own forces. Armed prophets succeed, but unarmed prophets must fail. The people are fickle, and when they no longer believe in you, you must force them to believe.
