is it an aluminum stick? most pro-shops carry heaters that melt the glue to pull the blade out. then you just heat up the new blade with glue on it, put it in, and let it harden.
if it's a synergy stick, you'll need to saw the actual blade off to get at the shaft of the stick. despite what some think, a broken synergy is not a dead synergy. lots of people i know take and reuse their broken ones. (although you'll never get the same weight-displacement that a new one is so good for)