Eating out may not be "primal" at most places (grassfed meats, local vegetables, no preservatives, etc) but it's pretty easy to eat out and stay low-carb, high-fat, moderate protein.
I ate out every meal for several weeks while my husband and I were moving cross-country and before we had our kitchen set up. I was afraid it would screw stuff up (just the sodium content alone, sheesh!) but I felt fine, even IFed parts of some days, and didn't gain a pound the whole time (I wasn't trying to lose).
So if you're at a restaurant, you don't need to order anything more expensive... just salad with seafood or chicken/steak on top and oil and vinegar dressing (not pre-mixed vinaigrettes or whatnot as they often have sugar in them) is a safe bet. Or a piece of chicken/steak/seafood - usually they're served with potatoes or pasta or whatnot, but NO restaurant has ever refused to replace the starchy sides with grilled veggies or steamed veggies for me.
At breakfasts beware - some popular chains actually put PANCAKE BATTER in their scrambled eggs and omelets. Be sure to ask and if you request it, they'll use "just real eggs from the shells" for you. Steer clear of the potatoes and hashbrowns - ask for extra meat (sausage/bacon) or fresh fruit instead.
Some people here are super-duper anti-microwave. But you do what you can... you can totally get some eggs (if you have a fridge) and make microwave omelets. A boy I used to babysit would whisk an egg or two in a bowl, add cheese, and microwave until it was set. He LOVED it - and super easy.
Frozen veggies are great - way better than canned nutritionally, and store longer than fresh. Most can also be microwaved.
You could also buy ham - beware of too much sugar or salt added though! - which is pre cooked, and store that in your fridge. Warm it up or just eat it cold. mmmm.