auto-manual

is it really worth switching from an auto to a manual? how much would the parts cost new? how about used? and how many hours of labor does this call for?

my question is about cost and hours involved, not the parts

I really don't think so. You will most likley be able to trade it for a manual and lose less money, if you even lose money trading it, than if you were to go through the trouble of converting it.