Q: Is it difficut to change a water pump on 1999 mercury mountaineer? on 1999 Mercury Mountaineer

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This the first time the problem has occur and I need to know if this is something I can do myself.
(1) Answer
If you have the 5.0L V8, the job is not terribly difficult, depending on your mechanical prowess. It is mostly just removal of components for access, and reinstallation of everything.

The 4.0L SOHC V6 is a slight bit more complex, involving radiator removal. But again, not terribly difficult -- just time consuming and a bunch of removal and installation. Good luck.