If it helps, when I first transitioned to ovo/lacto-vegetarianism it was a sudden decision that came in the wake of a change in personal perspective regarding general activism. Having been a cheesemonger/buyer for several years that knew a lot of the farmers creating the cheese personally (many long phone conversations, trips to their farms and through their fields/operations, flying across the country to the New York Fancy Food show, American Cheese Society conferences, etc), my initial stance was that it was better for me to continue to promote artisanal cheese such as from Jasper Hill where I knew the cows were at least enjoying most of their life instead of those in large factory operations because I'd stomped through the fields with them. I was aware that everybody on the planet wasn't going to be able to have the mental fortitude to give up flesh overnight as I had, so at that time I was still convinced that 'staging' people out of factory situations through local farms as they moved towards a meat free diet was a good thing. In the end I wound up transitioning from omni to vegan in less than a year. So it goes.