Well, in fact there are just 2 things that caught my atention at the end of Part 1, it's that after the chuunin exam was over, Hinata's whole attention was over Naruto, she didn't even think about her role as a Hyuuga anymore, it was only Naruto and that since one event. And that event is the little filler chapter Kishi made when Tsunade came back to the village as a Hokage. We saw all Teams killing time together and when we saw Hinata's team, she was admiring Shino and Kiba for having a goal, something they really love. And she even thought "Me too, I would like to have a passion like they do." And after that it was only about Naruto. Do you think there could be a link between this scene and her future obsession with Naruto? Writting it, I have some doubts it seems stupid to think that, but I wonder what could be the purpose of this chapter and especially Hinata's thoughts, since after that she didn't found any passion excpet her obsession about Naruto.
And also the thing that is disturbing me about NH in Part 1 is the fact that she's the last character we see when Naruto leaves the village. She's stalking him and think "Me too, I won't give up Naruto/ I will do my best" But what was she talking about? Her love for Naruto? Or what? And the fact that she's the last one being seen, stalkiing Naruto, makes me a little worried. I have to admit that if we hadn't seen scenes like Naruto fighting for Sakura against Gaara and the POAL, I would say that Part 1 was clearly showing an ending of NH/SS, but then Part 2 is clearly hinting at NS. I even myself wondered if Kishi had not just changed his mind when he began Part 2.
Allow me.
The thing is to overcome herself. She really hasn't done that. Confidence is the main issue on her character and yes, it has to do with Naruto, because he is her idol. Remember, the databook, after part 1, declared that it's admiration, arguably today as well. Now, whether you want to say it became love, well the point is that it erases the idea that part 1 she wanted love. What she want is acknowledgement that she has improved. The thing is what Naruto do, is something Hinata would like to see a hero would do. It's like "Look at him, saving that guy from the mistake. That's an idol and I'm proud of it." There's a reason why people has said that Hinata connects with everyone as friends (chapter 615), because this is her superhero, and the world has see him as a hero as well, an idol. Everyone is influenced by him, hence never give up. When you think about it, you too would be embarrassed to see your idol do something dumb because it's like "that's your hero..." Referring to the chuunin exam fight with Kiba with the fart and if you want to include the RtN prologue, same thing applies as to say, "My idol is a pervert thief...T_T"
Last character to see him to go. The thing is Hinata didn't update that much because she has confidence issue, let alone can't go to see someone in the hospital. So she didn't have a good resolution. That is until the end to be motivated once more. Now, I will give you this. I too thought the same. But rereading it, it gave me an idea that NS has a chance, but I don't know if Naruto can keep up. Turns out much later of my growth, he never gives up. Ever. Also, Kishi has said that romance is something he wants to try in part 2. Again, part 2. That would mean part 1 isn't as serious as it is now. That means all can be regarded a good friendship bond from many characters, making it a usual Shounen ending with no love at the end. That has changed. For starter, Sakura is the first to meet Naruto in part 2. Took another while for Hinata to show up. Next, the whole flirt, which comes as a surprise. Then, well you know the rest. The game changer that seriously cannot be destroyed and quite honestly, something that really screwed all others horribly was the second arc of part 2, mainly Yamato's dialogue. It's the cliche work of disguise of what's already there being hidden.
As for changing his mind, well going back to part 1, it seems like everything remain the same to me. Hinata only showed up in part 1 for one arc and then brief on meanwhile and the end. That's it. Naruto got a lot of going and now, here we are, the evidence is way, way, way, too much to ignore. The parallels are also what kill it. Honestly, we got nothing to fear.
Although some databook states that his hobby is gardening or watering plants, so you never know with this type of guy. 
