Creda built-in oven hinge change

Just wondering – how difficult is it to change hinges on an in-built oven?

Just the main oven hinge is broken, has been for a while. The kids (somehow) put a piece of a ceramic tile under the middle bit of the door and that damaged the left hinge. We did not notice it was broken until the glass unhooked itself from the bottom. Now the glass hungs only on the top and when I tried to put it back it got off again. The left side of the door is lower and the bottom of the glass rubs against the metal at the bottom. Also, the metal bit glued onto the door at the bottom came off – must have been the stress of holding the door higher for a while.

Any tips?

Thank you 😥