I'm currently using GB 0.9 and would like to move to RC 1.2. Just to be certain that I'm doing this correctly I should SBF back to 602, take the OTA update to 605, run the one click root method to root and then use which bootstrap program to eventually get into CWM to flash Liberty 3 RC 1.2? I have the LG bootstrap and the droidx bootstrap apks, but do I need the droid3 one for this?
Use Droid 2 bootstrap or LGB Bootstrap. Or you can install via the Toolbox
Boot Manager