Instruct: Classify Amazon reviews into positive or negative sentiment
Query: tricky to install, but worth the hassle.

Got these screen protectors to protect the touch-screen. Once I figured out how to install them, they are great. The installation of the protector is tricky though. Make sure the screen is CLEAN. The screen protectors come sandwiched between clear peel-off sheets on each side and little paper tabs attached. When you get the protectors, and after your screens are clean, you peel off the thin film that was keeping the screen-side of the protector dust-free and squeegee it on (to remove bubbles) and then, and this is the part that got me, you have to peel off the thin film that is now between you and the actual screen protector. I had trouble getting the top film off, and for a minute, was very frustrated because it looks like the paper tab is all that needs to be peeled off, but it's not. There's a whole film there that gets peeled off. After you manage to get that top film off, the screen protectors are GREAT!