So, you're going to go through some changes. Be ready to forget what weekends mean. You'll probably start getting frustrated with weekends, because you'll wonder "where the hell did all of these people come from?".

I highly suggest adopting an alternate wake/sleep schedule. Or rather, I highly suggest not resisting the change away from the "normal" 9-to-5 schedule that everyone else accepts upon them. I personally went to bed at sunrise and got up around noon. I also put work at the end of my day, rather than the beginning, which allowed me to pay attention to my health in a way I've never been able to accomplish otherwise. You have no reason to work their schedule, yet you'll end up A) getting stuck in their lines and traffic, B) paying their restaurant/bar/movie rates, and C) missing out on one of two amazing worlds: extreme late night or extreme early morning. The people you will meet there will be the most fascinatingly unconventional people in the world and they will inspire you to do great things. The fact that you are on this journey probably means you're one of them anyway. Go find your people. The people of the night are a close-knit community and help each other out in ways you can't imagine.

Now that I'm married, that doesn't work out too well, but I'm working on getting her to eventually be able to take the night as well :P

You'll probably end up working constantly. Learn how to take a day off: honest-to-goodness unproductive time (it takes you out of the fight-or-flight mode and gives your body a chance to recover). You probably won't be able to stand more than one day of it, as you'll get antsy and start feeling a need to make something. But it's necessary to unwind. Play video games all day. Go to the zoo. Watch movies. See your friends.

Don't think you can extend your runway with credit cards. You can't extend a blanket by cutting off the tail and sewing it to the top.

Stay open to opportunities. Make sure you keep meeting people. People are where the opportunities come from. Nobody is going to hunt you down and give you a chance.

It's better to take part-time work that pays the bills than it is to take full-time work that gives you lots of disposable income. Your time is far more valuable than anything any employer will be willing to give you. That's kind of the point, if your time were actually worth $80,000/yr, then they'd probably only hire you at minimum wage. Keep your time for yourself. If you live in a big city, you might be able to get by on bartending in a popular place on weekends. It's better than sitting in a cubicle farm.

You probably won't make it. Unfortunately, 6 months just isn't that much time. Oh, I think it's enough time to build just about anything, if the resolve is there and the freedom to work however you want (work tends to fill the time you give it, and most slowness in projects is the bureaucracy from which you are now free). But you'll learn that there is a lot more to making a project happen than the build phase. For example, if you haven't done any marketing yet, before the product is complete, you're already very behind schedule. You'll have to learn how to do all of those things that aren't programming, because otherwise you won't know what to look for to hire an effective person to do it for real.

That doesn't mean the time isn't worth while, but you need to know how to use it wisely and not become despondent if/when you finally cave and get a "real job." Use this time to learn as much as you can. Specifically, try to learn about yourself, i.e. how to motivate yourself to work on a consistent and regular schedule, how to get yourself out of ruts. You'll learn what you're capable of pulling off, even when you weren't sure what to do at the beginning.

And if you do "fail", pick up the pieces, dust yourself off, and get ready to try again.

This experience will change you. Try to let it change you as much as possible.