the first time i installed a glass protector... it was def nerve wrecking (i'm so ocd when it comes to air bubbles from dust and dirt). also, the price of these types of protectors is another incentive to not mess up!
i got the original glas.t when it first came out. i used the 'hinge method' (you can find videos on youtube on how to do this). basically you align the protector and tape the sides to the phone, creating a hinge, so you can 'drop' the protector after you take off the protective plastic and you'll get perfect alignment.
i added another part to my installation process. this involved me using those air duster canisters. after i got everything aligned and cleaned the screen with an alcohol prep pad (it came with the protector), i rigged the trigger of the canister so it'll constantly fire a stream of air (i just used a rubber band) and i just aimed it at the phone's screen so no dust settle on top.
then i took of the protective backing of the screen protector (i kept the duster continually firing at the screen), and when i'm happy that i didn't see any dust, i just let the protector drop on my phone. i didn't press down right away since i inspected it first to make sure no dust crept under at the last minute.
when i saw that everything was in order, i just pressed the middle of the protector and allowed it to do its thing. then you just use basically coerce w/e air bubble is still present, to the edges to get the finished look.
of course my ocd kicked in so i held my phone at all angles at a light source and no dust! it was a perfect installation!
tl:dr - use the hinge method (youtube has vids) to get perfect alignment, and REALLY make sure screen is dust free, for a perfect installation.