If you have a set of "easy outs" (bolt extractors), then bleeders are fairly easy to do since they already have a hole down the middle of them. You may just need to drill them out a little larger for so the appropriate easy out can get a good grip.

A lot of times though, if the bleeders have not been touched in so long that they've rusted to the point of breaking then there's a good chance that the seals are getting old, the pistons are getting rusty (a potential sticking hazard), the sliders are worn or rusted, etc. So, check them well, they may need to be replaced anyway. And rebuilt ones are pretty cheap ($30-$45). Don't forget to inspect the hoses while you're there!!!

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"Beer is living proof that God loves us and wants us to be happy." - Benjamin Franklin