Unbelievably forgiving wallpaper! I’m impatient - never measure - started from the top left and worked over. Took 2 rolls and “a bit” (see “never measure”). We put the third up in the corner and cut as we peeled it down. Won’t see that on YouTube with the professionals but it worked for this ADHD mom, lol. 
Note - as evidenced by the too high mirror I do admit that measuring can be critical . It will be adjusted!