I practice everything beforehand to get the muscle memory down. I also record VO as a part of my job. When I was in speech therapy as a kid, I would read into a microphone & listen to it back with my therapist. Recording VO is speech therapy for me, sometimes I have to record the same line 5 times but I get there. It's also taken me a long time but now I stutter freely and I don't hide it. If someone makes fun of me, they're just ignorant. It still hurts, just not as much as it used to.