A weekly 15-minute check-in
Same day each week: compare spending so far with the plan, move money between categories if needed, and note anything coming up.
A monthly reset
At month's end, total each category, see what worked, and write next month's plan. Adjust the plan to reality rather than abandoning it.
Expect misses
Most people need three months for a budget to feel normal. Overspending one category just means moving money from another; the plan still works.
Do this today
Put a recurring 15-minute weekly money check-in on your calendar.