Vise Grip pliers and a can of PB Blaster for the nuts and bolts that get stripped.
A good set of sockets, I second the Craftsman, they have a lifetime warranty. Regular and deep sockets are both useful, and get extensions as well for the bolts you can't get access to with the ratchet. Also, a breaker bar for the really tight ones. You can just use a section of pipe on a regular ratchet, but the ratchet will break if you push too hard.
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