I think I would try to choose whole foods (i.e. baked proteins with no sauces, steamed veggies, etc.). Those things are universal. Portion size estimating is something I think that becomes more accurate the more a person does it. This will allow you to look up the nutrition values more easily.
For example, Saturday night I ordered: grilled tilapia, steamed asparagus, and a garden salad with olive oil on the side. I asked for no oil on the fish or asparagus, estimated it to be about 6oz of the fish, 1 cup of the asparagus and 4 cups of salad veggies with 1T OO. I can usually tell if extra oil is added in the cooking; still, I add about 100-200 calories on to my estimate because oil is very dense and can easily go unnoticed.
"For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life." John 3:16
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