Butterflies in the stomach...
When we start being our best selves, when we start shipping, when we show up, we start getting butterflies in our stomachs. This happens because we have created tension not only for others but also for ourselves.
The tension is an indicator that we have taken action which might not work (which also means that it might). We are not comfortable with this uncertainty and hence we delay creating this tension in order to stay in the comfort zone where we are certain about most things.
But without this feeling, this tension, without the butterflies, there is no change possible.