You could try making a replacement topic, and then "reserve" the first few posts for your guide. But if you're making a long comprehensive guide, then yeah, maybe the Wiki would be better. x_x
And great guide! ^^ I just kind of skimmed over it (because I didn't want to spoil myself too much; forgive me!), but it looks great!
"If you want to understand, words are never a problem." --Rena Lanford, Star Ocean: The Second Story