When we are trying to adopt new behaviors, at first it takes a fair amount of mental energy to both remember, and carry out the new behavior. When that new behavior is something drastically different than normal, for instance a novice who desires to play competitive soccer, it takes a great deal of energy, and carries an extremely high risk of failure. Approaching a goal in such a fashion can be discouraging for anyone, especially a child. The key is to support children by helping them identify the tiny, incremental steps they can take to help them reach bigger, more fantastic goals.
As a parent you want to support your children as much as possible. Helping them realize that there will be many steps on a journey leads them to the challenge better prepared, and helps them take the time to savor the smaller victories along the way!