Anyone here replace one themselves yet? How difficult is it?

Do you have a body lift? That ought to make it easier...
Don't recall anyone doing it on an X, but the Pathy/Hardbody guys have done a few. It's not supposed to be too difficult, most of the work is done through the fender after removing the plastic liner. However, if you manage to break a stud (not all that rare), it gets un-fun. Hit everything with a good penetrant well before starting.

Brent