This1/2" overlap, then trim down the middle of the overlap and pull out both drops, leaving a perfect butt seam.
Personally, I won't put vinyl on sheetrock period.
Easy, if it is going to be permanent, wallpaper. If not, phototex removes clean and easy. While I am perfectly capable of hanging and finishing sheetrock, it's not my favorite thing to do. While I am sure there are decent wall vinyls to use my experience has been shrinkage, damage, or non-adherence.Interesting. I would like to hear more about your reasons/experiences regarding this.
You said wallpaper, not vinyl. Phototex same program. Personally, I won't put vinyl on sheetrock period.