From my experience, switching diets doesn't require turning your world view upside down. Maybe if your reason for going vegan is some life-altering epiphany? But I think most people already understand at this point, they just don't want to change. I'm not speaking here with judgment.

I'm vegan at home, though I'll sometimes make some exceptions for dairy when I'm out. Explaining that to anyone who wants to share a meal with me ranges anywhere from a brief heads up to a full on ethics debate initiated by the other person. It's weirdly common how often non-vegans feel challenged just by the existence of a vegan in their presence. Like I'm not trying to have a conversation about it. This is a very practical thing for me and that's mostly how I see this "lifestyle choice." It made sense for me to stop eating meat, so I did. No internal struggles or questions about my place in the world. Just logistics about how to navigate our meat-centric food culture. So yeah, I think the biggest challenge isn't overcoming some personal hurdles, but simply pushback from people and other external factors that make it harder to change.