1. Estimate the hours you think it will take to complete a task.
2. Double it and let the team know you did that.
3. Do the work well including good documentation.
4. Assess your progress when you've spent 50% of the planned hours. If you're not at least halfway done, avoid overworking. Instead, seek help within the team and descope.
5. Utilise any extra time for learning new and useful skills, if you finish ahead of schedule.
Cheers