Three overarching principles apply to all productivity tips.
Start with small increments. You can't expect to instantly change years of working habits overnight. Start with one tip, and keep adding more as you find strategies that work for you.
Be accountable. Answering to someone else can often force you to get the job done, be it a co-worker or setting your own deadlines and announcing them to others.
Forgive yourself. Accept that you will slip up with times or become distracted. It's better to move on than to dwell on your mistakes.