Yes
Google gingerbreak.apk , download and install it on your phone
Google flash image gui.apk , download and install it
Find a recovery that works with your device, rename the recovery to recovery.img and use flash image GUI to flash it.
Now download the ROM and flash it with the recovery.
-Google how to get into recovery with your device since its different with each phone. And I have a different optimus
I hope this helped. If you need more detailed instructions and the links to these things just comment and I'll find the stuff out for you