Some of the challenges that I first experienced with going vegetarian and then vegan were lunch choices. Because of my job, I often grab lunch out and about. Yes, I should prepare my lunch at home and I do that when I can, or steal home to have lunch sometimes too, but it isn't always practical and you have to find options. One of my favorite options is Chipotle. The food is usually great and fresh and there are so many choices. I personally choose, the vegetarian fajita bowl. I get rice, black beans, tomato salsa, corn salsa and my guac on the side with chips. Waaaayyyy too much food always, so you can save some for later, unless you're greedy like me (I can't eat dinner on the nights I go, I'm so full). The food is colorful and pretty and so tasty, if you haven't tried it, just know that there are vegan friendly opts all around. Check out the special diets section where they actually let you know what's out for vegans, yay. I really like what they do there.
My bowl.
Chips and guac are a must if you can indulge, if not, guacamole in your bowl is such a winner too. 
It's so beautiful.
-Ty