Don't open the phone all the way yet. The display cable is still threaded through the mid frame and you might rip the cables of the home and menu buttons.

Start to carefully lift the upper edge of the display assembly and thread the display flex cable through the mid frame.

Check if the home button or soft key button cables stick to the display assembly before your remove the display all the way.

In case one of the cables sticks to the display, carefully peel them off with a pair of tweezers or an opening pick.

Remove the display assembly from the phone.

Before reassembling make sure to remove any remaining adhesive from the frame by using isopropyl alcohol (>97%) and a lint-free cloth or Q-tip.