There area few different methods people have tried.
Hypnosis is one method, but may not be the most practical.
Guided meditation is another. There are several videos on YouTube that are guided meditations. I would recommend trying a few out and seeing how you like them and if you find them helpful.
There is another method I have read of, where one attempts the scrying in a mirror, in regards to possible past lives. This method like meditation takes time and practice.
I have found in my own experience past life work can be extensive and the information comes in bits over time. You will also find it helpful to attempt to check historical accuracy of some of the things you learn as you go. This can increase faith, and also help one along the path of differentiating what information to accept or not.
It depends a lot on your own belief, if you think reincarnation is even true.
The thing to look into is past life regression. Some things to consider, however, is that your past lives don't necessarily determine who you are now, depending on your beliefs. Some traditions hold that a past life may affect your status in this life, but a lot of that is associated with caste systems and believing one group of people is better than another by some indeterminate factor in this lifetime.
A friend of mine sometimes agrees to do a past life regression session for people, but he is strict about his methods and belief, advising people that doing it is meant for when someone has a specific purpose. That is, the desire to know just to know, he says, isn't good enough and whatever is learned won't be productive. But if there is a specific lesson or circumstance needed to be sorted out, then maybe it can be.
So, do so carefully if you choose, and with purpose. May you find your right answers, and only your right answers.
There are indeed past-life regression techniques, along with a couple between-life ones as well.
Though of the latter, the only one I know of is performed through a hypno-therapy session with a trained and accredited professional. It was developed by a person named Michael Newton (ph.d) who wrote a couple books that published the results of his career of client experiences, and I believe he passed on training of the procedure so if one looks around I believe the service can be found. For those curious the books are called 'Journey of souls' and 'Destiny of souls'.
Whatever method you choose, one thing to be aware of is that past-life exploration can start out a bit rocky for many people. When starting out, the 'loudest' events and experience come out first just by their nature. This means emotionally charged events that were personally significant, and emotionally painful. It is just how we are wired. Traumas are most easily remembered because remembering bad things means avoiding them later. Basic survival. As a child you climb a tree, a branch breaks, you fall and hurt yourself. Later in flife you find you have a fear of heights. You don't necessarily remember the event, but you remember that high up equals bad pain. This same effect applies to past lives.
So, the first task you need to hurdle through is learning to recognize these old lessons and let them go. It is tough, can make for a period if intense emotions, but if you can enter in prepared for it you can come out the other side wiser and more compassionate to both others, and yourself. And as you manage these past traumas, you will find more and more personal healing happening, and as you slowly clear out the noise, other more positive things will be unearthed.
Here's a quick tip. Easier to say than do sometimes, but something to keep in the forefront of your thoughts to help you along.
There is no need to fear, regret, or hold on to the events of your distant past. That was a different life, with a different you. A different you with a different story. One to learn from, but not to carry with you. It can't change who you are- it already was who you were. It can't make you 'evil' (some people fear that bad memories will make them a bad person). It also can't make you not-human (for some, not every life was human. Not every form between lives is human either).
Remember to be here, and now. You are at the present moment, within your present self. That is the place of your active self. Grow from the past, but live in the present. (Another couple of books I recommend, for their lessons of being in the present; Way of the peaceful warrior' by Mitch Albom, and 'The power of now' by Eckhart Tolle)
