I had to do it for a few months a couple of years back when I was bleeding out my arsehole, pritty easy to transition tbh, plenty of decent replacements available, Linda McCartney stuff is pritty good, Aubergine grilled is actually lovely and something I still eat to this day, I have oat milk instead of cows milk now.
Didn't notice any difference with my body but I was ridiculous fit at the time anyway.
Had a vegan diet for about 3 months, then I had to fast for 48 hours before having a camera shoved up my arse, ordered a large pepperoni pizza, it couldn't come fast enough, was delicious.