I have done a past life regression before. It takes meditation and complete open/clear mind.
I can say I was expecting to see my life in a whole. But what I got was glimpses of what was. (Still very cool) I can say from what I seen was that in the few past lives I was always a female. (of the ones I did see)
I seen my foot and toga from the Roman error, I seen myself in the mid evil times, in a black dress, more throws the poor side of society, and anther was from the pioneer days, I wasn't rich, but seemed on the well to do side. Here I was married and had two boys. I seen myself in a mirror in this image. My features were similar but not exactly the same. It seemed that I had the same eyes as I do today.
Over all experience was very interesting.
My advice, and was told by professional, never do this alone. You could allow something dark or even allow spirits to enter your body. So I would suggest to find someone who does this all the time and help protect you when doing it.
I did with 3 others who practice magic and have done this many times before. So I came out ok. But I will tel you this, I highly suggest people do this. I find it to be very educating. I was told the more you do it, the easy the images will come to you and make more sense to you.
I hope this helps. Good luck on your journey.