Unfortunaely two of the reasons this society is so abessed with positive thinking are as follows . The least fortuneate are always being blamed and any reason any thing will be used against them whether it lack of abilty lack of effort or lack of postive outlook . Also the establishment thinks the least fortuneate are spolied and undeserving of the freedoms and what standard of living they can manage to obtain so any complaints are viewded as the little the child from Oliver Twist asked for more .
I have found determination is far more effective than think things are going to be a peice of cake. Also knowing when to ask for assistance can be a great help . Confidence has little to do with compotance.