I went vegan overnight it actually wasn't very difficult!
It took me about a month to find a milk substitute that I liked and I hated tofu when I first went vegan but now I love it after persevering with it and trying different ways to cook it. I think that was the hardest part
My DD and DH are also vegan so we all eat the same meals
My DD is very happy to be a vegan because she knows she isn't killing animals
We take omega 3 derived from algae and a multivitamin which we took when we were omnivores
Alot of the mock meats/milks etc are fortified with B12 etc
There are alot of great recipes online and great vegan bloggers
I agree with a PP that says change meals you know it's probably easier that way but it's really a great time to try new foods also
We have alot of Bulgar wheat which can be precooked and kept for salads/stir fry's it a good rice substitute as its healthier and goes well with curries and chilli's etc.. So always have this in the fridge
Curries /chillies/lentil soup & bean soup are easily frozen
You can substitute tuna for chickpeas
Helmans vegan mayo is amazing
We have a beyond burger every Sunday as our cheat meal
Tofu can absorb any flavour so is a great substitute for meat I also use alot of mushrooms to replace meat
I also use alot of nutritional yeast (nooch) my DD likes pasta in tomato sauce so I put this in to give it a boost and it adds to the flavour it's good for adding to fake cheese sauce
I find soy milk is great for cooking but I use oat for coffee and cereal etc
Lentils instead of mince or just use a mock mince
Ohh and we make our own hummus as its so easy and so tasty
Chuck some tomatoes mushrooms onions and pepper in a tray, bake it with garlic some balsamic vinegar and a little liquid seasoning goes so well with the hummus on potato
You absorb more iron if you have it with vitamin C