Let's get two things out of the way first:
1. This is an expensive screen protector.
2. It takes patience to get a perfect install.
Now, with those two things out of the way, you should know that this is not your ordinary screen protector. This is tempered glass and it has a 9H hardness rating. It's incredibly resilient. You'd have to be trying to scratch this thing. On top of that, it behaves (both touch and look) just like the original Note II screen. It does not affect the S-Pen at all.
It is thick, but the edges are nicely tapered and pleasing to the touch. This causes the home button to feel recessed a bit, which I don't mind. Others have remedied this by using a home button sticker, which brings the button surface up to the same level as the screen protector.
Also, you should know that the protector does not reach the edges of the phone, but stops a few mm short. My understanding is that this is due to the slight curve in the Note II screen. This is a plus and a minus: the con, obviously, is that you don't have full coverage/protection. The pro, though, is that most cases, even ones with a big "lip" over the edge of the phone, should fit easily.
Overall, I HIGHLY recommend this screen protector. Well worth the price, in my opinion.
As for installation, you have to be patient. It's a precise fit. Here's a few tips:
1. Work in a low dust environment. A good idea is to work in the bathroom with a hot shower running. The steam will help minimize dust.
2. You'll need: the screen protector, microfiber cleaning cloth (included), alcohol swab (included), scotch tape.
3. Line up the screen protector as precisely as possible BEFORE peeling off the adhesive.
4. With the screen protector lined up EXACTLY the way you want it, secure it to the phone along one of the long edges using scotch tape. This will act as a "hinge" to make sure that the screen protector will be applied in the exact same position when you actually install it. Test this hinge a few times and make sure that the screen protector always returns to the precise position you want. It's very important not to change the position of the tape that's acting as the hinge.
5. "Open" the hinge. Use the alcohol swab and the microfiber cloth to clean the screen. Make sure there is NO dust on the screen.
6. QUICKLY (so as not to allow any dust to settle on the screen) remove the film from the adhesive side of the screen protector and use the tape hinge to get the screen protector in the exact position in which you had it previously. DO NOT TOUCH THE STICKY SIDE OF THE SCREEN PROTECTOR!
7. Gently press, starting at the middle of the screen protector, and work your way to the corners, getting rid of any bubbles.
8. If you notice any dust, lint, hair, etc under the screen protector, all is not lost. Lift the screen protector from the corner closest to the particle. Have a piece of scotch tape ready. When you've lifted the protector enough, slide the scotch tape in and use it to "fish" out the particle (which is usually sticking to the adhesive side of the protector. Repeat as necessary until all debris is gone.
9. If there are bubbles without debris, lift the corner closest to the bubble, and press the screen protector down, always starting from the middle and working your way out to the corner.
10. When all's said and done, you should have a perfect install. Remove the tape "hinge" and the outer film. There may be some "hazy" spots, but those will go away within a day.