Assembly is done in reverse order

Apply new touchscreen with double sided adheisive tape. Be sure to clean LCD surface before and remove any protective cover of new touchscreen

Some touchscreen are not exactly same as original, the flexible PCB has to be bent very gently to align with pads.

Make sure the LCD´s flexible PCB is bent back fully, as this will be the position in closed device.

Carefully solder all four pads.

Connect LCD and try the touchscreen operation before closing the device.