You are as ready as you are required to be

It's important to get things (dreams, bucket list, ambitions, career switch etc) started. It is more so to believe that you have already started it. 

There is a difference between getting started and already started. 

Getting started = Searching, finding, getting ready 

Already started = Done, you are in it, you are as ready as it requires you to be (This doesn't necessary mean you are all equipped, it just means you will definitely have a way to getting things done and this is important.

Faith if you call it (in spirituality), Confidence if you call it (in modernity), Being Gutsy (in my terms)

*Disclaimer: I'm not saying preparation is unimportant. I'm just saying just do it (whatever you have to)