Try to get the protector aligned up before you start to apply it. If you get more than 2 or 3 bubbles, then remove it and try again.
If you get a speck/s of dirt/dust then they will never go away, and could permenantly mark your screen. Don't worry, just remove the protector, apply some fairy liquid (washing up liquid)to the adhesive side, and wash under a running tap, gently rubbing with your fingers which will remove the dirt speck. Shake off any excess water and re apply the protector, you will get less bubbles, and any you do get will squeeze out easier. The protector does still stick firmly to your screen.
You will not know it is there, the screen is just as responsive as before, a great product.