Turn off your Apple Watch if you want extra safety
Place the watch face down on a clean, soft surface
Press and hold the band release button on the back of the watch
Slide the band piece sideways to remove it
Repeat on the other side if needed
Align the new band with the slot on the watch
Slide the band in until it clicks into place
Gently pull the band to make sure it is secure
Repeat for the other band piece if you are replacing both sides