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After wearing out some Goodyear tires over the first two or three years, I did my own alignment and put on a set of Firestone's. It's been five years now, never back to an alignment shop, and I still have the Firestones with no adverse tread wear, although I don't drive it as much as I used to. I made my toe equipment and made some wheel attachnents to use a digital level. Generally speaking you need to know as much or more about alignment than the pros, and have some equipment, or you'll end up with a bigger mess than you started with.