[Keyone]

Uhm, make it easier on yourselves and just use Windex. It lets you slide the screen around after application. Only downside is it takes a little while longer to "dry" and as with any application method, it takes several days to "cure". As OP said, the screen is a tiny tiny bit smaller than the actual screen, but it really doesn't affect its performance at all. Seriously, after a day or two, you won't even notice.

And FYI, it is not scratch proof, it's scratch resistant.