While there is a gross similarity between both words, there is yet a fine difference between being ready and being prepared, in terms of timing and expectations.
Now, you are probably more prepared than you realize for that big step that you want to take in your life. You may not be ready, and you really cannot be ready if you want to do something big and worthwhile. If you want to take up a big project (something you have never done before), you will always feel you can be better ready. Now will not often look like the right time and it is the reason why many people have given in to the tyranny of procrastination.
Here’s what successful people make a habit of: they put themselves in the ring and take their turn, even before they feel ready. Readiness is overrated!