When you go out to a regular sit-down restaurant, try to look up their information online first. And if the nutritional values aren't present, at least decide on what you're going to eat so that you can write it down & not even be tempted by looking at the menu when you get there.
As long as you walk in, knowing what you can & cannot eat then you will be OK. Fried Chicken Salads are the WORST, you might as well eat a double cheeseburger. Instead you could order the salad, but ask if they'll grill the chicken instead of fry it, or ask to leave off the cheese & croutons. Have fat free salad dressing, or oil/flavored vinegar instead.
Order any grilled chicken sandwich without cheese & bread, have a side with a baked potato instead of fries. As long as you know what foods you can have ANYWHERE, then you're prepared to eat out at restaurants that don't provide you the nutritional information.