I have a hard tome with this too however I have found a few things that help. Mint tea is good to drink before, it seems to awaken the third eye. I sit outside in the woods if I can day or night or in a room that I won't be disturbed in and light one white or yellow candle charged with memory recall and a sage incense. I also take and have a journal Nd pen near me so I can write things down before I forget them. Sit comfortable, this is key. Lotus position is not necessary but is comfortable if you fond siting down Indian style hurts you pelvis. Siting on a pillow is good to. If you can taking a stone of quartz, perderably smoky quartz or agar of rediah hue can do to, and making it so it will lay on your third eye will help too.
Imagine after you get in a normal meditation that your are going back in years. Details army important just major life events that remind you of your past. Go in order all the way back to your birth and you can just think of things that remind you of birth if you can