I started blockers in my mid teens and HRT on my 18th b'day.
I have never tried to change my voice, it never broke and was never deep, never had an issue with it.
Facial hair, I had a light to dark fuzz at the very most, it was waxed pretty much day 1 on blockers, it was lighter by the time I started HRT and within 6 months of HRT it had all but gone.
I did 2 laser treatments between day 1 and when it was gone.
Starting early is the best way to go.