What particular health benefits are you hoping to gain? I’m vegan and found dairy is in the most innocuous things like sweeteners so you need to really check labels. Lactose is used in most unless you get Stevia. You’ll likely never be 100% dairy free (which you probably don’t mind) as many medications are coated in lactose etc.
Vegan Philadelphia is absolutely delicious but try and get it when it’s on offer if you like cream cheese or make creamy sauces because £2.50 a tub is a joke. Nush brand is nice, but less readily available. Vegan Greek aka feta cheese is spot on everywhere from Lidl to M&S. Violife extra mature is like mild cheddar. Vegan Babybel is like little chunks of butter. A nice snack. Alpro custard I can drink from the carton

and margarine is margarine

and the vegan mayo’s these days are unreal.
A lot of “alternative” products contain junk so be mindful of that e.g. majority of oat milks contain canola oil so I’m trying to buy those without, but it’s more expensive.
I may be biased but I think going dairy free is very achievable these days with all the options, including own brand alternatives. Good luck!