Eh, you can make it work if you're willing to make the sacrifices. Definitely supplement with vitamin B12, you need that. Not a lot of it, mind you, but it is an essential that you won't get outside of animal products. If you take a multivitamin, that should suffice. There isn't a great way to get omega fatty acids, but chia seeds can work okay. Hemp seeds might be better, actually, but those can get expensive. Incidentally, hemp is great vegan protein. Rice and lentils form a complete protein, so keep that in mind for meal planning.