Adding a priority when I added a task always seemed so arbitrary. All tasks are P1 at some point, right?

After a period of constantly changing priorities on tasks as they came due, I finally just set all tasks to "No Priority" and then each morning, or the night before, when I review my tasks for the day, I pick only 3 absolutely must-do tasks for Priority 1, the 3 second most important for Priority 2 and so on.

This gives me a clear picture of what must be done first and to completion each day.