Budgeting is vital to any campaign or project plan. Although this process may feel tedious, it is better to have a plan, than to run out of money halfway through a project.
Truthfully if you want to safely stand at the summit making a plan could be the difference between life and death. Campaign planning and management is the same.
Just like my personal calendar, I start by adding the important dates and events. And then fill in the rest as needed. This gives me the high level view of the year and allows me to spot conflicts before they become a problem. In calendaring, the key to success is being proactive.