Here is a goal: How to cut fabric to make a ribbon?

Which way makes more sense to accomplish this goal?

- Use a pencil to mark the width you desire then cut outside of the seam with scissors, smooth the edges by pulling the ribbon against the scissors;
- Use a pencil to mark the width you desire then cut outside of the seam with a knife, smooth the edges by pulling the ribbon against the knife;
Use a pencil to mark the width you desire then cut outside of the seam with scissors, smooth the edges by pulling the ribbon against the scissors