Each week, I keep a running list of one-time tasks that won’t take long to complete (think registering for a conference) or things that are easy to postpone indefinitely (filing, working on a project with no deadline, etc). On Fridays, I set aside an hour of the day for a power hour. If there’s more than an hour’s worth of work on the list, I start the session by prioritizing the item. Anything that can’t be completed either gets added to my “real” to-do list for the next week if it’s a time-sensitive item, or rolls over to the next power hour list.
Power hours also work great for personal to-do items. I use the same system for things like errands and dreaded chores. Keeping a running list helps get things out of your head and onto a piece of paper (or in a note on your phone!) so you can save your mental energy for the real important tasks of the day.