Pick metrics that tie to real outcomes you care about: energy, revenue, depth of connection, calmness, or creative output. Add a small negative control when possible. If nothing changes during the control, you gain confidence your signals are genuinely informative.
Use a tiny template you can maintain under two minutes per entry. Date, experiment label, action taken, quick metric, and one sentence of reflection. Consistency beats precision. Automate reminders. Future‑you will thank present‑you for legible breadcrumbs when revisiting decisions months later.
Before you begin, write the decision you will make under three result patterns: better, same, or worse. Pre‑commitment reduces wobbling and backfilling. Share it with a friend to add gentle accountability and reduce the temptation to selectively interpret mixed outcomes.