Their are several different adjustments which you can make on the car. The toe in typically is specified with just a little bit of toe in, the idea being that when your driving down the road, any tolerances in the front end parts will allow the tires to run straight, more or less. The toe in is the most common adjustment and it's the one which most typically goes out, although that isn't necessarily the only one which can go out.
Their are several different ways you can adjust the toe in, some of them are more accurate, some of them are less, if you want to do it yourself. If you are going to take it to a shop, take it to a one man shop, instead of some chain, or take it to a shop that sets up race cars.
The tires can cause pulling, but if you thought it was the tires, you can switch sides on them, and try it. The pull will follow the tire.
You can also adjust the camber and caster, yourself, if your so inclined. If your into giving it a try, let me know and I'll do a diy-how-to, for you.
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