In the end, these are a fabulous way to get a tile look for cheap!  They are a bit shiny, and therefore I think its obvious they're not real tile. However, it gives the look.  
BE WARNED... if you get sheets with dark gray printing like my third photo, do not install. This shows through when installed AND those tiles were a slightly different white. Contact Wayfair, and a replacement immediately. They were great and sent 3 new boxes, no question. 

Once I got those, I was able to finish up. They do stick easily. Not super removable (tore the paper off my drywall in places, which I had to then prime because the dark color then showed through).  
And note not all tiles on the sheet are the same size (see 4th pic) so you cant necessarily flip the sheets to fill in spaces, as they won't line up. 
Always try to work in one direction per wall.  
For small spots and such, cut with scissors and fill in as needed.  
A little tricky overall, but worth it in the end!