I field, nearly always, in the covers. Mainly because I'm quite agile, and have got a reasonably safe pair of hands. But probably because I've got a terribly weak arm and can't field in the outfield, and can't catch balls that are skied. Really though, the hardest catches are the ones where you're at deep midwicket, for example, and the ball is hurdling to you at 100 mph as the batsman's really connected. The easier catches are the ones in the covers, imo, where if you have quick reflexes you're sorted.