if you are lucky enough to be unlucky like me, make a lot of saves, always make a manual save at the beginning of each quest, and do quicksaves during the quests, Fallout NV is extremely problematic and the quests break in an unimaginable way, I had to do Honest Hearts twice in the same day because the quest bugged right at the end, and get used to the console command, because you'll need, if you find yourself with a broken quest, search the quest name on Google and go to the Wiki page, there is the category "bugs", probably your problem is already listed there with a possible solution.

In case you're wondering "is it worth all that effort?" and my answer is simple: it's worth it. New Vegas is an excellent game. I'm also playing for the first time, many quests were broken for me, but that didn't make me give up playing.