how to put on a screen protector?

Hello there, my friend; if I can give you best advice (based on experience) and with best hopes that you will lisen it:

,,Get to the shop and let THEM donit for you", i've tried cpuple of times and guess what, so much bubles for my OCD.
Best wishes!
 
Ended up getting an ArmorSuit screen protector. The wet application method was a bit daunting but it is crystal clear and adheres completely to the curved screen edges. Really pleased.
 
Haven't noticed any on-screen scratch on my naked Lumia 520 for almost a year with heavy and rough usage. But i bought some cheap screen protector from eBay. 3pcs for 0.99 😄