I have read a few of the negative reviews of this product as well as larger size screen protectors. All of them whine about how difficult it is to install w/o bubbles. Here's the deal, if you want your screen protect and don't want to spend a lot more by going to the mall and having the phone encased by one of those guys at the kiosks then this is the best alternative. By putting down a very rugged polymer layer you are going to be susceptible to small bubbles due to very tiny particles constantly floating through the air, but if you install it carefully it won't be an issue.Just cut the sheet to the correct size. Ensure screen is wiped down. Peel off sizing grid and align the sheet up w/the glass. Start at the top of the scree and work your way down. Never use an applicator. Do not try to press down w/your fingers. Do this EXTREMELY slowly. Let the sheet do the work for you. Slowly push the screen protector from the edge furthest away from the glass. Let the air get out of the way and don't try to "shove it out of the way"...that's the trick. For something the size of an iPhone the process should take 3-5 minutes. If you are going faster then you are asking for problems. Yes you will end up w/some tiny bubbles on the order of 1-2mm in diameter, but when you turn the screen on they will be completely invisible to you, so no worries. Once you'v applied the layer, it's ok to chase the edges w/your finger nails to push any air out from there.I hope this helps.