The number one would be shipping product (or anything really) out in front of a customer. If you can't work together to get something done fast, that is usually a huge indicator that somethings wrong. That usually means your values or mission aren't aligned.
If your concerns are around negotiating between investors and the Company, the best thing you can do is to retain a great Silicon Valley based law-firm. There are about a dozen highly reputable firms that are very startup friendly that will often defer most legal bills or charge inexpensively du...