I went from someone who ate everything to vegan, cold turkey. It wasn’t hard for me, but that just depends how committed you are to it. There are some great dairy-free icre creams, sour creams, yoogurts, etc. Just sample a few until you find one you like. For me the hardest part was giving up my leather purses and shoes that I already had in my closet, but eventually that wasn’t too hard either after I bought replacements.