There are different ways to enter the plane in different situations, but in this practice, watching resistance or pressure is used as the main one. There are more general and more specific reasons for this.
More generally, the practitioner is literally unable to detect and see (be aware of) all the planes of his being, the connections between them and the sequence of changes. A huge number of planes and their states, formations of various kinds, the duality of manifestation, both personal and impersonal, relating to this body and to the hierarchy of worlds, are hidden behind this body, thoughts and feelings.
It should be accepted that when we manifest aspiration towards the Divine, we receive direct guidance from it for the sequence of actions. In this case, pressure (resistance) indicates the place where the change should occur.
Although there is a general tendency that in the descent the planes open from top to bottom – i.e. first mental, then vital and physical, then in a cycle at a deeper level, and periodically the direction changes from changes inside the body to changes outside it, but for a particular practitioner the picture is further complicated by the imprints of its entire history of development. The descent takes hold of all planes, preparing them for change, but the perception is explicitly or implicitly concentrated in one.
At some point, the plane opens (becomes accessible). You can enter it and bring about its transformation, full or partial. The progressive transformation of the planes is like untying the knots one by one, without breaks or gaps, and gradually rebalancing the manifestation.