Ann Maries answer is closest.
Here is a more detailed step by step process:
Notice there is a small pivoting piece which should move freely on the shorter hinge piece. (If you cant see it, that's because the longer hinge piece is currently in the way but it will become visible later in this detailed process.) Put the oven door on the floor and force the long hinge part towards the short one. This will take a lot of force. I recommend you use multiple layers of a thick material or an old towel to protect your hand. Get the hook on the long hinge piece close enough to the small pivoting piece on the shorter hinge piece, then move the pivot all the way over the hook. Now you are ready to begin installing the door. Lift the door into place and insert the top and bottom pieces into the door uniformly on both sides. Once the longer hinge pieces are engaged so that the door is supported(nothing else matters in fact it will feel like the hinges are not fully in place but thats ok), move the pivots on both sides OFF of the hook and then simply close the oven door. Ouila!!! (I was incredulous when it worked!)
Jim
November 2014