Loosen each string until it is slack
Remove the string from the tuning post
Remove the string pin from the bridge
Take off the old string
Clean the fretboard, bridge, and guitar top if needed
Insert the ball end of the new string into the bridge hole
Reinsert the bridge pin while keeping the string in place
Pull the string gently to make sure the ball end is seated
Thread the other end of the string through the tuning post hole
Leave enough slack for several wraps around the post
Bend the string slightly at the post to hold it in place
Wind the tuning peg to tighten the string
Keep the wraps neat and moving downward on the post
Stretch the string gently by hand
Tune the string to pitch
Repeat for the remaining strings
Retune the guitar after all strings are installed
Check intonation and tuning stability after a short playing period