Vegan in Rome

My family is taking a trip and spending about a week in Rome, Italy. I've already scoped out some amazing looking vegan spots, but I'm wondering if there are any tricks or suggestions to getting good pasta dishes (and other local cuisine) vegan in a non-vegan restaurant.

I'm very much used to ordering in the states at Italian places, just usually avoiding homemade pastas as they're usually made with egg, making sure the sauce doesn't have meat or cheese in it - but I have no experience in Italy.

Thanks in advanced for any ideas!