Hi,
when was the watch last serviced? if it was any longer than a year ago, even though it might look clean you will find the old oil has dried out and become gummy. This alone is enough to stop a watch. Once it has been cleaned and oiled it should run ok, if not you will then have to start looking at worn pivot holes/cracked jewels. If this is a nice watch then put it away and forget about it until you have gained some experience working on some cheaper watches. You will know when you feel ready to tackle this watch. Whatever happens just remember to come an ask if you run into any problems. We are all here to help 
Paul.
