Upper door latch needs replacing

The upper door latch broke off when I caught it on my sleeve. The part is available but I want to know if we can replace the latch ourselves? The door looks like it is sealed pretty good. Thanks for any help.

Entire dooor replacement is best course here. even if the part is availaable seperatly, youll need to order afewdifferent parts that you will break to get into as well as the extra labor to remove and reinstall the parts, the complete door ( if available and cost prohibting) is usually best course of action