Some reviews say it’s super easy, I would
Definitely recommend having two people to do this especially in the corners! It took us about 3 hours to do this wall, specifically because of cutting around the window and making sure the pattern was correct above and below. 
The wallpaper did come a bit damaged in one of our packs, I’m currently working with Wayfair to resolve this issue (In the end they refunded me for the wrecked one), but luckily enough for this wall I ordered more than needed so the extra was just going to be for a difference project. 
I would recommend ordering one more than required to be on the safe side, I measured the wall to order and didn’t deduct the window from that calculation in order to be sure I would have enough. 
Overall, super happy with this and glad I decided to go for it! Easy way to update a room! 
TLDR two people needed to install, beautiful print and texture, totally worth it!