Yay for you! Nine year vegan here, I remember saying I would never do it either. But now meat and dairy aren't even things I think about, let alone miss.
There is no answer that will please everyone. It's best to treat veganism as a religion, as in an ethical framework that guides your actions. But just like religion, it's not polite to talk about it nor judge others for believing differently. You'll absolutely encounter people who feel comfortable for mocking your beliefs, including friends and family, but the best strategy is to smile and say you'd rather talk about something else. You can't control if others decide to be jerks, but tend your own garden and remember there is no profit in being argumantive back. Eternally change the subject and you'll rarely be accused of being preachy. Unfortunately there are those who take your meat as an inherent judgement of their own, but that is a dilemma they need to fix themselves.
Having said that, I applaud your choice and urge you to get b-12 supplements. A large chunk of the population is deficient anyways and while you adjust there is a good chance you'll miss some of the supplements added to meat products that mostly likely were your primary source.
My partner watches him a lot and while personally dislike Hasans loud yelly bro style I've never heard an opinion from him that I disagreed with.