My child went vegetarian in in approx 1976. It was hell, but we managed. These days it's really easy. Suitable for vegetarians is a usual label in shops now.
As for every day meals, they are abundant, you really don't need meat substitutes.
Child, now adult, is the family's main cook. Veggie meals we frequently have are
Aubergine Italian. Layers of Aubergine in a tomato sauce, with mozzarella.
Cauliflower cheese, with added carrots and broccoli, heavy on the mustard.
Split lentil "shepherds" pie . Substitute the meat for split lentil, add seasoning of your choice.
Veg stirrfry. Veg of choice, plenty of spice.
Child went to university at a very cosmopolitan city, and got into the habit of using chinese, Vietnamese and Indian shops. Eating veggy, accord to them, is quite cheep as well as tasty.