When we want to plant flowers, we must first weed the garden. Same for humans to grow.
Clearing works by clearing up the layers of emotions around a particular topic or situation, such as negelect or even abuse. The subconconscious doesn't understand time, to it, everything is now.
Yet our subconscious beliefs create the world we live in: take for example someone who had an experience of near drowning, maybe today they are very fearful of water, but the water is neutral, plenty of people enjoy swimming.
We know we are in good shape when we can look back at a situation and it no longer triggers us.