I want to invent something cool.
Kickstarter, Klout, Etsy
What's rewarding is having a vision for the future and making it happen. What's frustrating is not always having the necessary resources.
Not taking the time to periodically step back, challenge assumptions, re-assess, and re-prioritize.
If you try split your time between practicing your high-wire act and sewing your safety net, both will fail -- put all your energy behind your best idea. Go big. Persevere despite setbacks -- they're inevitable; it's your ability to recover that matters.