How can i install it without any smudges because of the case i have-Belkin Grip Vue (Vapor) for iPod touch (4th Gen.)?

I mean the case is so tight around the ipod that when i try to put protective screen it just won't fit perfectly after i put the case back on.It literally pushes the film from the screen.Thank you.

Power Support HD Anti-Glare Film Set for iPod touch (4th Gen.)

Power Support HD Anti-Glare Film Set for iPod touch (4th Gen.)

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