I'd personally recommend you always buy a replacement power & volume button flex cable when doing this repair. They're usually only a few pounds/dollars/euro to add to your order when already buying a replacement screen and battery. The reason I say this is the cable is super fragile and easily fails near the buttons where it bends sharply round the side of the frame. I just finished this screen repair to discover that my power button only works when the cable is straightened, and doesn't work when the button is in place on the side... looks like I'm back to waiting for the postman to bring me another part :)

When removing the motherboard, the front camera module's connector on the backside of the board tried to be retained by its recess in the frame. I had to peel the tape off the back of the front camera, then remove the motherboard, and finally prise the connector away from the frame before reinstalling it on the motherboard.