A plan is only useful if it survives contact with the day. The usual failure is not laziness. It is optimism: twelve tasks, each imagined to take twenty minutes, with no room for the call that runs over. This routine takes about five minutes and is built around fewer commitments.
1. Look at what is already fixed
Open the Today list and the Day view in the calendar. Anything with a time is a fixed point. Plan around those, not through them.
2. Pick three things that matter
Scan Today and choose at most three tasks that would make the day a success. Set them to P1 or P2 so they stand out in the list. Everything else is a bonus.
3. Put a size on each one
Open each task and set an estimated duration in the drawer. Writing "90 minutes" next to a task is often enough to reveal that three of them do not fit in one afternoon.
4. Match tasks to your energy
Tag the demanding task High Focus and the admin Low Energy, then look at the Energy Map. Put the hard thing in the morning window, and leave the afternoon for the tasks that do not need you at your best.
5. Leave a buffer
Count your estimated durations. If they fill more than about two thirds of the time you have, move something to Tomorrow. The buffer is not wasted time. It is where the unplanned work goes.
6. Work in blocks
Start a Pomodoro on the first task. Twenty-five focused minutes with a break after is easier to start than "work on the report".
Why fewer tasks works
Every task you add to today competes with the others for the same hours. Capping the day at three important tasks forces the trade-off to happen in the morning, when you can still choose, rather than at 5pm, when the day has chosen for you.
You can do all of this in Minmento: capture with Ctrl + Space, plan in Today and the Day view, and focus with the built-in timer.