YCombinator will not take on companies with one founder because the non-direct workload is significant in most cases and few people would have the energy to keep going through all the set backs. Even if you can, you are unlikely to go fast enough to make the most of your product before the competition starts taking your customers.
Of course there are exceptions and small projects that just work but unfortunately, you have to take some serious risks to give your company the best chance of success so trying to hold on to a "day job", for example is a distraction from your new company.
Best advice is probably to find some local entrepreneurs and get their advice. Paul Graham writes about stuff but although he has a lot of experience, it doesn't necessarily mean his advice is 100% reliable or accurate - which also doesn't mean that you should ignore it!