Best Pda Screen Protector How Do You Apply A Screen Protector On Pda So That It Fits PERFECTLY With No?

How do you apply a screen protector on pda so that it fits PERFECTLY with no? - best pda screen protector

Defects such as bubbles or cracks or anything.
I have this PDA-phone and send 1 tmobile screen saver (it seems that the cost) is less than a dollar and have only 1 chance to apply perfectly
Any advice is greatly appreciated! Thank you!