#4: Slow down.
Plastic exists to support the go-go-go lifestyle that we all think we need to maintain. Committing to cutting back on plastic gives you a reason to insert some helpful speed bumps into your day. So enjoy them! Take 10 extra minutes to eat breakfast at home, for example, or use a full 30 minutes to eat lunch at a restaurant, off glass plates using real silverware, rather than grabbing something packaged in plastic to eat at your desk. Along with the benefits of avoiding plastic, you'll gain an opportunity to catch your breath, enjoy your food, and let go of some stress.
#5: Don't be a jerk about it.
None of your plastic-addicted friends wants to hear a lecture about the evils of plastic (ours sure didn't). Be relaxed and nonjudgmental when you talk about your decision to cut the plastic cord. Focus on why the alternative is better, not on why plastic and the people who use it are evil. And let your deeds, rather than your words, be the strongest argument. Every time you tell a cashier you don't need a bag, and walk out of the story carrying your carton of milk in your hand instead, you're planting an idea in the head of everyone around you. And that's how new norms are created.