The Poor Man's Watch Forum has a fantastically thorough guide to taking out a watch movement, I pretty much followed the advice there (apart from using a movement holder, and a wealth of other things I don't have).
The crown needs to come off to free the movement from the case. To release the crown, there's a little button nearby that's pressed as you pull the crown out...
... I'd read somewhere to put the crown back in once the movement is freed, as a handy grip to turn the watch over without marking the dial with fingerprints or what have you. Having the crown in place meant I could line up the hands in a position easy to set later on.
Having the crown in place meant I could line up the hands in a position easy to remember for later on too.