Just be sure to prioretise goals and work plans. Stating most goals in general subjective terms. Be as specific and as precise as you can be when stating your goals. Not appreciating individual differences. Some kids just can't apply themselves as others to the team's goals.
Kids grow and mature at a different pace.
Some are where you'd like them to be at when you first meet them, and some will perform for the coach two seasons away. Kids may experience different learning curves, and may have a variety of preferences for lead-up games, drills, and feedback remarks. What may seem challenging to the coach and some kids on the team may appear as boring to others. Holding on too long to unrealistic goals. Let go and move on.