Ooh! I knooow, that's so hard to do! It was evident on one of my short stories I posted here one day, kind of a... a play on romance while I didn't know how to write it... I didn't do too well since I wanted it to be quite short, I'm sure.
Finishing a story... We shouldn't think much of that! Unless one makes it to the end and has to make some big decisions... Or writes alone and just has to dwell on it for a while.