Client from hell? Hell yes! I have read about such clients so many times in the so many posts by so many other freelancers out there in the past and present. It is unavoidable I suppose but this is partially due to my own fault (to be fair). What was a 1 to 1.5 months job turned out to be 3 to 3.5 months of work. In fact, it has not actually been “concluded” yet but it is at least more or less a done deal (I’ve been paid full).