It's caution that I suggest. As "cool" as it may sound, you do not know what lurks on the other side. It could be an angel or something much darker. I had an experience in my teen years with something dark that scared me utterly. I do not wish the same for you.
I agree that mirrors could help you, as well as astral projection and meditation, but before you attempt anything, make certain that you are either with someone more experienced in the practice than you are to help you if you encounter difficulty or that you seriously protect yourselves from darkness, which exists in concert with the light to bring balance into this world.
Stay safe always; Blessed be.