Well, since you got your answer I won't give mine. I'd probably just confuse you and I think Healer probably knows allot more about this then I do. So if you want my answer, I'm agreeing with her. :)
But what I wanted to say is that just because some things are possible doesn't mean everything is.
You see, Past Lives are a result of the Soul Cycle. The Soul doesn't die, it just adopts a new life in a new body.
Lycans and Vampires aren't as they are portrayed in Hollywood. Vampires may actually be inaccurately called such as may be Lycans, but it's mostly Hollywood that gives people the wrong idea regardless.
Fairies I don't know about, but from what I've seen and heard they only exist on the Astral. Similar to the thought-forms, perhaps, that Healer mentioned. I'm not a Fairy expert so I don't know for sure.
Point is that if you were asking simply how to make a fantasy book be true, or how to put yourself into a fantasy world, most people would tell you that it is impossible because it is. Healer's method may work, but you can literally make Harry Potter and his friends be your friends here in the real world. Not unless you know a kid who happens to be named Harry Potter.