So I've been playing for hours, done TONS of side quests. I don't know how to progress the NCR faction questline. I could pass off "the house always wins I through IV" if i wanted to, but if i do, it says the NCR will no longer accept my help. I don't know how to get to Hoover Dam, or even how to move on with the quest line. I wish I could tell you what the last NCR quest I did was. I think it was the quest involving radio transmissions...

Any direction would be just lovely!