I also have dropped my 920. Thought it was the screen, is it actually the digitizer? The touch screen still works...
You can buy an aftermarket screen/lcd assembly for about $40. It is very easy to replace on the 920. If you want to do the outer glass only, that's possible too.
If you haven't done it before, I'd recommend the full assembly. You will also need T2, T4, and T5 torx screwdrivers. You can buy a kit of those on ebay as well (very hard to find them in stores because they are so small).
After you have the screen and the tools, you have around 10 screws, a couple of flex cable connectors, and a few coax snap connectors, and you have a new phone.
This and the 635 are probably the two easiest ones to replace the whole lcd/touchscreen assembly on.