Chosen Solution
how can i fix cracks manually, at home, without buying or paying for anything?
You will at least have to buy a glass for the screen and replace that, but a glass is like $8 with free shipping. Be warned though, glass only is very difficult, and you will more likely than not ruin the LCD. glass http://www.ebay.com/itm/like/30199621611… some resources to look at on glass repairs(you should look up more, this is just a starting point) http://www.youtube.com/watch?v=z9drzO9hO… https://www.youtube.com/watch?v=SJ05sPZD…
I have to concur with Ethan on this one on having to at least by replacement glass. Although I have done a few of these core Primes with no damage to the lce as they are not laminated together.