The method of vipassana is investigation.
“Full understanding by investigating is that insight-wisdom (vipassana-panna) which has the three general characteristics (anicca, dukkha, anatta) as its objects and when arises when attributing a general characteristic to physical and mental phenomena…” —Vism. XX.
Investigation is one of the Seven Factors of Enlightenment. In practice, investigation means taking the characteristic of impermanence and applying it in one's own life. Since looking at things in terms of impermanence is a different view to that one is normally accustomed to, applying it becomes a matter of investigation. Crossing over to the other shore means one must eventually put one's entire belief in impermanence, but this cannot be a sudden process, it must be gradual and the result of investigation- what happens in situations when one interacts guided by the principle of impermanence and not by that of self ?
“There are three kinds of training (sikkha) in Buddhism, namely: the training of morality (sila), in concentration (samadhi), and in wisdom (pañña). The training in morality is able to dispel only the third stage of the defilements, that of actual transgression. As there remain two stages undispelled, the defilements temporarily put away by morality can arise again and soon fill up until they reach the stage of transgression. […]
The third training, the training in wisdom—the knowledge that belongs to insight and the knowledge that pertains to the supramundane path—is able to dispel the first, latent stage of the defilements left undispelled by morality and concentration. The defilements that are entirely got rid of through wisdom, leaving nothing behind, will never rise again.”
—“The Manual of Insight”, (Vipassana Dipani), Ledi Sayadaw.
"One who earnestly aspires to the unshakable deliverance of the mind should, therefore, select a definite "working-ground" of a direct and practical import: a kammatthana in its widest sense, on which the structure of his entire life should be based. Holding fast to that "working-ground," never losing sight of it for long, even this alone will be a considerable and encouraging progress in the control and development of the mind, because in that way the directive and purposive energies of mind will be strengthened considerably. One who has chosen the conquest of the five hindrances for a "working-ground" should examine which of the five are strongest in one's personal case." --The Five Mental Hindrances and their Conquest, Nyanaponika Thera.