A little planning goes a long way. It's well worth it to invest the time upfront and work more efficiently later.
You just have to believe it will work that way to convince yourself to actually do the planning.
Planning and organization also give you substantial peace of mind and can be a procrastination-buster (because you have a plan to follow and you can see the steps it takes to complete the project).
Try spending a few hours planning and a few hours working instead of many, many hours working with no plan.