Thanks everyone, and yes I realize I could have worded it better. Afterall I did go from one faux to another
The tile went right over the existing wallpaper, and due to this tile having "texture", you will not see any sign of the wallpaper.
The product I used is called "Bellagio" made by Smart Tiles from Home Depot, and in order to cover over the brick wallpaper I used 9 of the tiles.
The radius cuts for the window aren't so bad as you'll just have to take your time with a pair of scissors. Either through dumb luck or skill I got both radius cuts done without a mistake. You may want to purchase a couple more tiles just in case.
Remember that you're not butting each tile from end to end. You need to partially go over the next tile in order to match the "grout line". The seams will disappear.
Prep was done with rubbing alcohol and a paper towel, especially behind the stove where it was a bit greasy.
Lastly don't lay the tile flat or else you'll get air bubbles. Match the grout seam on one side, then start pressing slowly while working out the air bubbles with your other hand.