Hm, well, there's really countless ways of being initiated. Initiation is such a truly magical thing...*thinks of Mystery cults in Greece* Ah, if only if only...what I would give to be a part of one of those, back then.
I've made a few 'declarations' to the Gods, the biggest being when I shifted focus from my Greek patrons to the Celtic gods (Irish and Welsh). Those are always personal, deep, not to be shared with others. I take them very seriously, since I'm making a deal with the gods I am declaring to. Especially in faiths and practices where devotees are ridden by their patrons it's a huge commitment to the deity...
I was 'properly' initiated by two other people two Imbolcs past. Using 'Wicca' by Viviane Crowley helped me understand what was happening, magically and psychologically, to me during this time. I rather enjoy her writing, even if I am nowhere near a BTW/Gardnerian Wiccan. I thought it was an interesting experience, again, private. Some initiations that were private are now published, but I still think that some secrecy is a good thing. Going through an initiation cycle and two helped me begin to form my own initiation cycle for my own tradition. So helpful!