I think I am one of the lucky ones.
When my husband and I started researching to be more cruelty-free in how we live our lives, we didn't have any idea that we'd end up being vegans. Funny thing is, he came to the conclusion first.
But for me, a switch flipped. I don't want to wear, eat, or wash in anything connected to animals. The very idea has instantly become revolting.
For my husband, a switch didn't switch, and the thought of eating animals isn't revolting to him, just wrong. So for him, it's harder and more difficult. His attitude is more along the lines of "doing his very best without sweating the small stuff". He happily eats whatever I prepare or whatever he cooks for himself, but in a social setting he might have "just a taste" of something, even though he does believe it is wrong. Not meat, but a buttered roll or a slice of cake. For me, bile rises at the thought of eating butter. It's a reflex. For him, he feels a bit deprived, will taste it, and find out for himself that it's not worth the taste.
So. I don't have to fight an urge and it's been easy for me. For him, he sees something he's eaten easily and happily his entire life, and he has to resist it.
What I didn't realize is that not everyone is lucky enough to get an instant gag reflex.