Also, you don't want to be talking in falsetto at all, if you do speak in a higher range, you want to be using mixed or head voice so your voice will sound louder, clearer and less breathy, and less sounding like a "man attempting to sound like a woman". You can read many articles on mixed and head voice, although in fact youtube videos may be better to hear the demonstration to get a feel of the concepts, as descrobing it can sound confusing.
It basically means having falsetto with vocal chord closure - the best analogy I can make is to try and impersonate a soprano opera singer - that kind of tone. Mixed voice, as it suggests, mixes modal/chest voice with the 'operatic' head voice - with this, you can speak louder and even shout in a much higher and feminine range.
And yes, this improves hugely with time and vocal muscle memory.