Universal Loving-Kindness Vipassana meditation is an exercise in mindfulness, egoless awareness. It is a procedure in which the ego will be eradicated by the penetrating gaze of mindfulness. The practitioner begins this process with the ego in full command of mind and body. Then, as mindfulness watches the ego function, it penetrates to the roots of the mechanics of ego and extinguishes ego piece by piece. There is a full blown Catch-22 in all this, however.
Mindfulness is egoless awareness.
There is always some mindfulness present in any moment. The real problem is to gather enough of it to be effective. To do this we can use a clever tactic. We can weaken those aspects of ego which do the most harm, so that mindfulness will have less resistance to overcome. Greed and hatred are the prime manifestations of the ego process.