Really, truly EASY.  I stripped my walls down to PLASTER.  The bare wall space was from the edge of window into a corner and onto another wall to the other window, around a 1940 wall heater, and electrical outlet: so, you name it, this little project had it.<br><br>This product is DURABLE, THICK, and true QUALITY.  However, this is not like hanging wallpaper, and when I made the equal splice at the overlay, for whatever reason, it did NOT seam properly.  I love hanging wallpaper, and have much experience doing so, so I was able to correct the issue to the untrained eye (but I was still miffed about it, so I didn't try THAT again (with wallpaper, you can nearly never find a seam of mine, so it bruised my ego, I suppose, more than anything)!  I messed up a tad on that, and the heater was in the area of a GORGEOUS CHARTREUSE coral :'(<br><br>One tip:  wallpaper is a repeated pattern, this is NOT (which is the BEAUTY of it).  So, if your purchased size is too large for the wall area; look at what you WANT to see, and what will need to be cut away, so you get to see/keep everything you most want in the end product!<br><br>Truly, it's NOT as hard as you think!  Just have patience, don't rush, and in the end I hope you're as THRILLED as my 10yo is waking up and going to sleep feeling like he's swimming/scuba diving in the ocean by a coral reef♡`