Loosen each old string gradually until slack
Unwind the string from the tuning post
Untie the string from the bridge
Remove all old strings
Clean the fretboard, bridge, and soundboard
Insert the new string through the bridge tie block
Leave enough slack for wrapping at the tuning post
Tie the string securely at the bridge
Thread the other end through the tuning post hole
Pull the string snug by hand
Wrap the string around the post neatly
Keep the wraps moving downward on the post
Tune the string slowly to pitch
Repeat for all six strings
Stretch each string gently after tuning
Retune until the strings stay in pitch
Trim excess string ends if desired