Why is Agile so hard?

The simplicity of agile methods such as Scrum make you ignore the fact that it takes lot of effort to practices them in a right way. My Scrum Trainer, Pete Deemer, told us in Scrum class that if Scrum is followed or understood correctly then it is worse than waterfall. In Scrum, you rely upon self-organising teams who do the right things to build product right. Like any other methodology, successful implementation requires couple of die hard believers who really want to adopt a new way of working to achieve better performance of team. If this is complemented with good experience on Scrum projects among few team members then the agile adoption goes very well.