Football management is all about physchology - the players didn't get to this level without having the talent, your coaches will make sure your players are fit - as a manager your job is keeping their feet on the ground when they are on a high, bringing them back up when they are low, avoiding complacency when it's an easy game, making them feel they can win when it's a hard game, etc. Maybe you even bring in people from the outside to help - whatever the method it's the essence of management to not let the last result impact the next one. If the players go into the next game thinking about losing to Derby then the manager has not been able to succesfully manage the situation and we might as well not turn up. Of course the players are only human but that is what a managers job is to manager their emotions especially when times are challenging.