Ensure the Motorola Moto G51 5G is completely powered off. Press and hold the power button, then select 'Power Off' from the options. Wait until the device is entirely off before proceeding.

Use a SIM card eject tool to remove the SIM card tray. Insert the tool into the small hole next to the tray and press gently to release it. Set the tray aside in a safe place.

Use a heat gun or hairdryer to gently heat the edges of the phone's screen. Move the heat source around the edges for about 2-3 minutes to soften the adhesive. Be careful not to overheat the device.

Place a suction cup near the bottom edge of the screen. Gently pull up to create a gap. Insert a plastic opening tool into the gap and carefully slide it around the edges to loosen the adhesive. Avoid using metal tools to prevent damage.

Once the screen is loose, carefully lift it from the bottom, opening it like a book. Use a spudger to disconnect the screen's ribbon cable from the motherboard. Set the old screen aside.

Remove any protective films from the replacement screen. If necessary, apply adhesive strips or screen adhesive to the frame of the phone, ensuring a secure fit for the new screen.

Carefully connect the new screen's ribbon cable to the motherboard. Ensure it is securely attached and aligned properly.

Align the new screen with the phone frame and press it gently into place. Ensure the adhesive bonds well by applying even pressure along the edges. Use a microfiber cloth to clean any fingerprints or dust from the screen.

Place the SIM card back into the tray and insert it into the phone. Ensure it is properly seated and flush with the edge.

Turn on the device by pressing and holding the power button. Once the phone is on, test the new screen for touch responsiveness and display quality. Check for any irregularities or issues.