Totally agree. The first day or two are the easy ones. It's the days after that. When you wake up in the morning and feel its hard to get out of bed and do it again that's when it gets into the mind game. For me if I'm really in the correct shape to hunt the mind game isn't so hard to over come.
I would say that when you think your in shape and you've made your goals, you should make new goals and keep pushing yourself to do more then you expected. The extra work will pay off in the end.