first, that size tile, I feel is for the floor, BUT with proper prep, it will work on the wall also.
Here is what you need to consider; amply screw that backer board to the studs every 8 inches and with stainless steel screws. Do this on every stud within that sheet. Use 1 and 5/8 inch screws and counter sink that head to be flush.
Set the tile in place with thinset, NOT mastic. When applying the tile to the set thinset, waller it around in place a bit to ensure that the entire back surface is set with thinset. I would also not go up too high all the same time. In other words if the wall is 8 feet, then only go up 4 feet the first day and stop. Let that set before moving on. this will ensure you have a good foundation for the remaining 4 feet. Wait four days before grouting, then three days wait after that.
The worse thing you can do is to grout before the thinset has set, then covered with grout, the stuff will never dry and cure.