Its worth paying the little extra for a new screen that comes with the frame(housing/bezel) as you will not need to separate the broken screen from the frame and will have a nice new bezel.
Same procedure for i9300 T999 i747 i535 L710 
If you've seen the drop test then you might find this puts your mind at ease for replacing the screen..
Metal Frame Swap
DIY repairs will void any warranty but may save you £$ :-)

The sim tray for the i9300 will fit the i9305 and possibly other models.

FAQ: Can I just replace the glass screen as its only $20?
If you follow the link below you'll see it can be done with the right equipment


High resolution scans to identify the parts:
Mainboard & Parts 3Mb
Antenna Connections 1Mb
Screen Back 3Mb
Replacement Screen

Dial *#0*# to enter diagnostics
W1 is for GSM/3G
W2 is for Wi-Fi.
The white antenna cable is for Wi-Fi only.

Shot up close with a Panasonic HDC-SD700