The laying of the protection is easy and well described in the manual. The protection is seen very little once asked, and covers both the screen. The screen retains its reactivity, it just feels a "softness" physical to touch either with a finger or stylus, softness brought by the flexibility of the protective screen.
Only regret the stylus that it is actually easier to hold in hand, is therefore too large for storage in the GamePad. So that you always loses.