Step 1: Clean the window or glass.
Step 2: Measure the exact size of the window and cut the opaque window film to the suitable size.
Step 3: Remove the backing protective film (transparent film). Step 4: Wet the window and the backside of the film with soapy water (the more, the better).
Step 5: Stick the glass film and smooth the film with hands.
Step 6: Squeegee away redundant water and bubbles.
Step 7: Trim off the margins.