School is what did it for me, my program was pretty rigorous and I didn't want to mortgage my future by letting my grades suffer. Plus, I was working full time anyway. I just waited until 2 months before I graduated, started my LLC and have been slowly working at it ever since. We're just about ready to ship our first product and I didn't even quit my job. My main suggestion, write down your ideas as you have them and keep them somewhere for later when you have more time.