Action may not always bring happiness; but there is no happiness without action.

Doing something does not guarantee it will go well. What is reliable is the other direction: sitting still produces nothing to be satisfied about, and contentment turns out to be a by-product of being engaged in something rather than a state you can arrange directly. Waiting to feel ready is waiting for an effect to arrive before its cause. Movement is the price of the possibility.

Pick the smallest available action on the thing you have been deliberating over and take it today. The feeling you are waiting for usually shows up somewhere after the beginning, not before it.