If past life regressions can be interfered with by interlopers, what precautions will be effective to avoid this?

As we indicated to you, this is rarely a problem because it is a facilitated interaction and dialogue for something that is done routinely by the very deep subconscious all on its own many times during the day. Because the deep subconscious is disconnected from conscious awareness, a person has no conscious awareness this is going on but may well feel an emotional fallout from the stress it can cause. This becomes very real and is often misinterpreted because of its uncertain origin. It contributes to the generalized state of unease and anxiety in so many individuals, and without an origin to blame, can be deeply disturbing and seemingly beyond the hope of reducing it—because its presence is inexplicable, to begin with, and there does not seem to be any place to start to satisfy the concern, the emotional fear or tension being exhibited.