1. Unwind the old strings
The first step is to unwind the old strings. You can do this by either hand or with a string winder. If you're using a string winder, be careful not to twist the new strings as you're putting them on.
2. Remove the old strings
Once the old strings are unwound, you can remove them from the guitar. Be careful not to damage the bridge or the guitar itself while doing this.
3. Clean the bridge and guitar
Before you put on the new strings, it's a good idea to clean the bridge and the guitar. This will help keep the strings in place and make them sound better. The best way to clean a guitar is to first wipe down the body with a soft cloth. For more difficult to reach areas or stubborn dirt, you can use a slightly damp cloth. Be sure to avoid getting moisture in the sound hole or near the electronics. For the fretboard, you can use a dry cloth to remove any dust or debris. If the fretboard feels sticky or stained, you can use a mild wood cleaner or guitar polish.
4. Put on the new strings
Once the bridge and guitar are clean, you can put on the new strings. Start with the low E string and work your way up. Be careful not to twist the strings as you're putting them on. To put on the new strings, put the ball end of the string into the hole at the top of the guitar neck, and hold the string tight against the fretboard as you wind it around the tuning peg. Make sure the string is tight against the fretboard as you wind it, and that the string is not overlapping any other strings.When you've wound the string all the way around the tuning peg, hold the string down at the fretboard and cut off the extra string. Do this for all six strings.