A constant headache for me: sticking to a schedule. Even with my best efforts and careful planning, unexpected events and distractions often throw me off track.
This makes it hard to stay organized.
Try to create a routine that meets your goals, but focus so easily slips when there are competing responsibilities and unpredictability.
So, as it is with most things, start small. Scheduling is a difficult component, but it is just a tiny part of the larger picture.