Well, having your voice down increases your passability more than any other single thing, in my opinion, so having even just a voice is a great start if you're anxious to go full-time.
I wouldn't suggest going full-time early for most people, though. Often, living as male can be debilitating and frustrating and horrible, but the risk of ridicule and shunning is very real if you try to live as a woman while not passing. Being a societal outcast sucks, specifically for what it might do to your income and mental/general health.
My opinion? You should wait a little while longer - maybe for a year of HRT. Make sure you can pluck your eyebrows, learn how to do your make-up if that's your thing, and give yourself some time to develop a strong sense of style and fashion. Believe me, fashion sense takes time. I bought many things early on, and looking on that old collection... I can't see why I would ever want to wear those clothes.
There's another important thing that needs to be worked on, too: your personality. Many times, pre-full time trans girls get obsessed with girly things. Make-up, jewellery, boys, revealing clothes, and other such stereotypes. It's not uncommon, and it's probably a valuable phase to go through, but most move beyond it as they mature into trans women. Some like to be badass trans women, some prefer to be more reserved and mature, and so on. Be whoever you want to be, and don't worry about whether a cis woman would be like whatever you want to be like. There's bound to be at least a couple cis women who are very much like [anything].
Overall, delaying full time saves money, it's less risky, and you'll be more prepared. I say wait, and let yourself free when you're ready - whenever that is.
