I love eating Ramen.
InnovaTek, LLC (it sort of is my life at the momment)
I'd have to say the unforeseeable nature of day to day events. Around every corner are frustrating lows when you hit a snag as well as huge highs when you land even a minor victory. It definitely is a roller coaster ride, but one I'm enjoying immensely.
From what I've heard of startups that don't make it, it seems like a lot of them over commit financially too soon. While having office space is nice, the garage works just as well until you have a semblance of a stable income.
Network - it is all about the contacts. Often times someone that you know peripherally will end up being really important to your success.
Have a plan - if you can't convince yourself, you aren't going to convince anyone else.
Determination can overcome just about any hurdle.