Lay the watch face down on a soft cloth
Identify the spring bars or screws holding the strap
Use a spring bar tool or small screwdriver to remove the strap
Compress the spring bar and release one side from the lug
Remove the strap from both sides of the watch
Insert the spring bars into the new strap
Position one end of the spring bar into the lug hole
Compress the other end and snap it into place
Pull gently on the strap to confirm it is secure
Repeat for the other side
Check that the strap fits properly and the watch sits comfortably