A:Answer My stylus works fine on both my phone and my tablet. The Zagg shield does not affect the use of stylus pens at all. I'm not sure if the geek squad would install it for you but there's other sales associates that could help you. The trick is to ensure that you are working on a clean surface, using non-lint paper towels or dishcloth, and use enough of the applicator spray to keep the shield (and your fingers) wet - not just moist, but wet. Work quickly and don't worry about bubbles - you can squeegie them out after. But work from one side to the other (I go top to bottom) and ensure your device is turned off so no "water" damage is done.