you can try skrying, meditation, sometimes drinking a psychic tea before bed can give you prophetic dreams that could contain past lives. through meditation it just happens, the deeper you go, think to yourself 'show me a past life' and you may see something. skrying might be easier since thats the main focus.
@ FADARE meditation is basically relaxation, the key is to quiet the mind and let thoughts flow. sometimes you can silence all thoughts, but normally you just sit and relax and don't hold onto thoughts. try playing some soothing music, a metronome, or count your breathes. saying a mantra [om, peace, calm] can also help. start with just 30 seconds and slowly work your way up from there.