I preform Past Life Regressions with my hypnosis clients often. It really depends on if you allow yourself to be guided back into your past lives, and if the hypnotist understands how to guide you back into them. The problem with recordings is that they are a script, and hypnosis is not "one size fits all". The way the person who recorded it may not work for you.
I personally feel that every soul is old, immortal and eternal. We're all old souls, who have lived through various incarnations. But, each time, we come back with a new mind, new personality and new thoughts as well as a new body. We're not the same person. Just the same soul experincing life through a new person.
I would advise looking into learning self-hypnosis and studying up on different ways to do PLR so that you can find what works for you. But, don't worry about it too much. You soul may have been someone great in the past but, now, you are you. Live your life now. Don't try to live off the past.