1. Gather the necessary tools: a new guitar string, a string winder, a wire cutter, and a tuner.
2. Remove the broken string by untwisting the tuning peg and pulling it out of the bridge.
3. Use the string winder to turn the tuning peg counterclockwise until it stops.
4. Thread the new string through the hole in the tuning peg, then around the post.
5. Wrap the string around the post several times, then pull it through the hole in the bridge.
6. Pull the string tight and use the wire cutter to trim the excess string.
7. Use the string winder to turn the tuning peg clockwise until the string is in tune.
8. Repeat steps 2-7 for any other broken strings.