The kit was very easy to attach, although I was a bit afraid due to multiple reports of bad experiences. It took a couple of tries (less than 7) and even some of the air/liquid marks remained after using the squeegee, they disappeared completely after 2 days! This was pretty amazing.
However if you never used protection before, pun intended, you'll notice that the feeling is not the same as glass and that gliding your finger won't be smooth any-longer as your finger will stick slightly due to the rubbery material.
Since I purchased it to fix a deep scratch I was afraid would grow, it did it's job as the scratch disappeared completely.
By the way, the instruction material and branding is incredibly clever, a real adventure.