Mercedes Junk Yard Is It Hard To Replace A Door In A 2003 Mercedes ML-350?

Is it hard to replace a door in a 2003 Mercedes ML-350? - mercedes junk yard

I was thinking of a purchase is a junkyard of the same color of my car and swap-out. I know that the electronics and the air bag at the door. I need to replace at least the rear passenger door, but also needed to replace the door on the passenger side as well as time.