Saying your going to do something and then actually doing it are two vastly different things as we all know. I would almost have to argue you have to hypnotize yourself in to doing something that is difficult, but deep down you know you want to do. So do it. First break down the task into small accomplishable tasks then proceed with the first one. Tell yourself you will enjoy this first step and begin. Then keep following each step, and keep insisting to yourself it is the best step of all. You will begin to build momentum and soon you will forget it’s difficult at all. And you will finish it. Then you can start another.