Digitizer / screen replacement tutorial?

There are lots of videos on youtube. My recommendation is to spend the extra couple dollars (literally like $2 more) and buy the screen assembly with the frame. It makes the job super easy. Then all you need is to follow the ifixit guide for removing the motherboard found here: Motorola Moto E4 Plus マザーボードの交換

It is a fairly easy repair. I do recommend buying a replacement earspeaker as well in case you damage yours trying to remove it from your old frame.