Three Cheers for Overanalysis!

I have no idea how to lose weight. I'm pretty good at gaining it (oreos. Lots of oreos. Also, chocolate and ice cream). I know how to keep it steady (live at home and give no thought to what I'm eating. Avoid spending too much time in Cammie's kitchen). But losing it? I have a general idea of where to begin--consume less total calories while burning more of them--but little idea of how to actually manage it.

Currently, I'm working off of "three meals a day, all snacks are fruit." Before, it was no snacks, but I decided that was a terrible idea. Also, I've already bent the snack rule to have some snap pea crisps and pistachios, which were yummy. Plus, the snap peas were green and therefore healthy (I know I'm deluding myself. Please don't ruin it for me). I also spent half an hour swimming laps, and I intend to repeat that. The issue is that I don't know how much balances out how much. Like, am I actually eating less? Or am I just eating healthier? Does it matter? Will excercise alone be enough if it does? Also, how long is this going to take? Am I going to manage to eat in a remotely healthy fashion when I get to school, because I really don't want to turn into more of a lard-ass than I already am.

The biggest issue, I think, is going to be in the Fall. Also, developing enough self-control, and figuring out how best to manipulate myself to achieve these ends. I'm not sure that "be healthy!" is sufficient (i.e. it's not sufficient, not at all). I'm wary of making it into an issue of self-control, though I suspect that's going to be what finally works. Right now, I feel relatively in control of the direction my life has taken; I made my own decision about where I'd be come September, and I'm comfortable with that decision and don't feel an excessive need to micromanage my life. The weight gain thing feels like an issue of self-control, which worries me. At the same time, when I get to college, I'm going to be introducing a lot of new stressors into my life. I'm worried that if the academics get tough, or if the social scene is confusing, I'm going to start feeling out of control in more ways---and that if I think of dieting/exercise a means of adding control into my life, I'm going to end up going overboard. I think, if I'm careful, it shouldn't be a problem (also, I am a loooong way from being anywhere near worrying), but I'm still paranoid.