need a website on how to replace d600 outer screen case please

Hi, i need to change the outer screen case on my d600 as i dropped it nd the outer screen now has a crack init luckly it didnt touch the actual screen. I did try and do it but i didnt have a small enough scredriver for the second part of taking out the next part of the screws which were tiny.I got upto the brown clip taking it off and i think when i put it back on again it didnt click on properly so now my screen doesnt comeon either. The speaker and everything else works on it fine as during the night someone called and it went off but i could see who was calling obviously. The bottom pad comes on the keypad with lighting aswell. I would really appreciate it as i need my phone back asap as im 15 to call my dad and stuff like that. Thanks!