You don’t have to do it religiously. You can eat meat in one occasion, and avoid it in another. Especially these days the meat-supplements are getting pretty good. I would opt for them more often if they weren’t more expensive than real meat.

Really just gets easier over time, until it's just a habit

I can relate to this so I'll just add that aligning my diet with my values was the best decision I've ever made. Being able to eat without feeling guilty/confused/complicated was life-changing. I didn't do it all at once, or torture myself.

And we live at this amazing time when you can be lazy AND get amazing not-morally-horrible food! Typing this as I munch on an entire package of addictive store bought animal-free chocolate chip cookies :P