My mechanic just told me that the rear calipers were sticking on my Del Sol. He said he'd try "resetting them" to see if that fixed them, but otherwise I'd be in for a $500 replacement of the rear calipers.

How much could I save by replacing the calipers myself? Is it worth it in such a saftey-critical area as brakes? I've replace a timing belt & halfshafts before, so I'm pretty sure I could do it, but I'm not sure I want to. Thoughts?